ACTH-independent Cushing’s syndrome due to bilateral adrenocortical adenoma

https://doi.org/10.1016/j.radcr.2021.07.093

 

Abstract

The chronic excess of glucocorticoids results in Cushing’s syndrome. Cushing’s syndrome presents with a variety of signs and symptoms including: central obesity, proximal muscle weakness, fatigue striae, poor wound healing, amenorrhea, and others.

ACTH independent Cushing’s syndrome is usually due to unilateral adenoma. A rare cause of it is bilateral adrenal adenomas.

In this paper we report a case of a 43-year-old woman with Cushing’s syndrome due to bilateral adrenal adenoma.

Read the case report at https://www.sciencedirect.com/science/article/pii/S1930043321005690

Hypopituitarism and COVID-19 – exploring a possible bidirectional relationship?

As of September 1, 2021, the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which is the virus responsible for the coronavirus disease 2019 (COVID-19), has infected over 219 million and caused the deaths of over 4.5 million worldwide. Although COVID-19 has been traditionally associated with its ability to cause varied symptoms resembling acute respiratory distress syndrome (ARDS), emerging scientific evidence has demonstrated that SARS-CoV-2 causes much more damage beyond its effects on the upper respiratory tract.

To this end, in a recent study published in Reviews in Endocrine and Metabolic Disorders, the researchers discuss the extra-pulmonary manifestations of COVID-19.

Risk factors for severe COVID-19

It is now a well-known fact that the likelihood of people falling severely ill or dying from COVID-19 is increases if these individuals are obese, or have certain comorbidities like diabetes mellitus (DM), vitamin D deficiency, and vertebral fractures (VFs).

Any abnormality in the pituitary gland may lead to metabolic disorders, impaired immunity, and a host of other conditions that also make the body susceptible to infections. Since such conditions are common in patients with COVID-19 as well, it has been hypothesized that there might be a relationship between COVID-19 and pituitary gland disorders.

On the other hand, researchers have also observed that COVID-19 causes increased severity of pituitary-related disorders, and even pituitary apoplexy, which is a condition defined as internal bleeding or impaired blood supply in the pituitary gland. A group of Italian researchers has reviewed this bidirectional relationship between the pituitary gland abnormalities and COVID-19 in their study recently published in Reviews in Endocrine and Metabolic Disorders.

The link between pituitary gland abnormalities and COVID19

The pituitary gland releases hormones that regulate and control some of the most important functions of the body like growth, metabolism, energy levels, bone health, mood swings, vision, reproduction, and immunity, to name a few. The inability of the pituitary gland to release one or more of these hormones is known as ‘hypopituitarism.’  Factors responsible for hypopituitarism include traumatic brain injury, pituitary adenomas (tumors), genetic mutations, as well as infiltrative and infectious diseases.

Hypopituitarism can lead to severe cases of DM, growth hormone deficiency (GHD), abnormal lipid profile, obesity, arterial hypertension, and immune dysfunctions. Interestingly, similar consequences of COVID-19 have also been reported.

SARS-CoV-2 infects the human body by binding to a special class of receptors known as the angiotensin-converting enzyme 2 (ACE2) receptors. These receptors are located in the endothelial linings of most organs like the brain, heart, lungs, kidneys, intestine, liver, and pancreas, among others. The main function of the ACE2 receptors is binding to specific target molecules to maintain the renin-angiotensin system that is crucial for regulating dilation of blood vessels, as well as maintain blood glucose levels, the immune system, and homeostasis.

Therefore, SARS-CoV-2 binding to these ACE2 receptors facilitates the entry of this virus into all the organs that have these receptors, thus leading to the ability of SARS-CoV-2 to cause widespread damage in the body. Upon entry into the pancreas, for example, SARS-CoV-2 can inhibit ß-cells function, which worsens hyperglycemia and increases the risk for acute diabetic complications.

Similarly, the presence of ACE2 receptors in brain tissues may cause invasion into the pituitary gland and lead to pituitary apoplexy. The entry of SARS-CoV-2 into the brain can also cause neurological damage in infected patients, which may account for some of the common neurological complaints of COVID-19 including headaches, confusion, dysgeusia, anosmia, nausea, and vomiting.

Study findings

Hypopituitarism leading to metabolic syndrome has been scientifically linked to higher mortality in COVID-19 patients. In fact, the presence of a single metabolic syndrome component has been observed to double the risk of death by COVID-19. This risk was even higher among patients with DM and hypertension.

There was also an increased incidence of VFs in COVID-19 patients with hypopituitarism. Hence, patients with DM, obesity, hypertension, and chronic inflammatory disease, are all at an increased risk of poor outcomes and death in COVID-19.

Arterial hypertension is a common finding in adults with GHD, which is another consequence of hypopituitarism. Hypopituitarism also causes adrenal insufficiency, a condition that is primarily managed with glucocorticoids and hormonal replacement therapies.

Notably, patients with COVID-19 are often treated for prolonged periods with high-dose exogenous glucocorticoids, which is a class of steroids that suppress some activities of the immune system. This treatment approach may result in suppression of the hypothalamic-pituitary–adrenal axis that can lead to adrenal insufficiency.

Hypogonadism is another aspect of pituitary insufficiency that predisposes patients, especially males, to COVID-19. Evidence shows that males with hypogonadism were more frequently affected by metabolic syndrome.

Pituitary apoplexy, albeit rare, has also been linked to COVID-19, especially in patients with pituitary adenomas and those who are being treated with anticoagulant therapy. This may be because the pituitary gland becomes overstimulated during an infectious disease, which may increase pituitary blood demand and lead to sudden infarction precipitating acute apoplexy.

This phenomenon has also been shown in patients suffering from infectious diseases that cause hemorrhagic fevers. Taken together, pituitary apoplexy complicates treatment and management procedures in COVID-19 patients.

Despite the use of steroids in COVID-19 patients, there have been no contraindications for vaccination in such patients. However, those on extensive hormonal therapies need constant monitoring for best results.

Implications

The pituitary gland acts like a double-edged sword for COVID-19. On one end, hypopituitarism predisposes patients to metabolic disorders like DM, obesity, and VFs, all of which are known risk factors for COVID-19.

On the other hand, COVID-19 may cause direct or indirect damage to the pituitary glands by entering the brain and inducing unfavorable vascular events – though evidence on this remains lesser in comparison to that of hypopituitarism. Ultimately, the researchers of the current study conclude that managing patients with hormonal insufficiencies optimally with steroids is likely to improve outcomes in severe COVID-19.

Journal reference:

Endocrine testing in obesity

Affiliations expand

Abstract

Endocrine disorders such as Cushing’s syndrome and hypothyroidism may cause weight gain and exacerbate metabolic dysfunction in obesity. Other forms of endocrine dysfunction, particularly gonadal dysfunction (predominantly testosterone deficiency in men and polycystic ovarian syndrome in women), and abnormalities of the hypothalamic-pituitary-adrenal axis, the growth hormone-IGF-1 system and vitamin D deficiency are common in obesity. As a result, endocrinologists may be referred people with obesity for endocrine testing and asked to consider treatment with various hormones. A recent systematic review and associated guidance from the European Society of Endocrinology provide a useful evidence summary and clear guidelines on endocrine testing and treatment in people with obesity. With the exception of screening for hypothyroidism, most endocrine testing is not recommended in the absence of clinical features of endocrine syndromes in obesity, and likewise hormone treatment is rarely needed. These guidelines should help reduce unnecessary endocrine testing in those referred for assessment of obesity and encourage clinicians to support patients with their attempts at weight loss, which if successful has a good chance of correcting any endocrine dysfunction.

Similar articles

COVID-19 and Cushing’s syndrome: recommendations for a special population with endogenous glucocorticoid excess

Rosario Pivonello,a,b Rosario Ferrigno,a Andrea M Isidori,c Beverly M K Biller,d Ashley B Grossman,e,f and Annamaria Colaoa,b

Over the past few months, COVID-19, the pandemic disease caused by severe acute respiratory syndrome coronavirus 2, has been associated with a high rate of infection and lethality, especially in patients with comorbidities such as obesity, hypertension, diabetes, and immunodeficiency syndromes.

These cardiometabolic and immune impairments are common comorbidities of Cushing’s syndrome, a condition characterised by excessive exposure to endogenous glucocorticoids. In patients with Cushing’s syndrome, the increased cardiovascular risk factors, amplified by the increased thromboembolic risk, and the increased susceptibility to severe infections, are the two leading causes of death.

In healthy individuals in the early phase of infection, at the physiological level, glucocorticoids exert immunoenhancing effects, priming danger sensor and cytokine receptor expression, thereby sensitising the immune system to external agents. However, over time and with sustained high concentrations, the principal effects of glucocorticoids are to produce profound immunosuppression, with depression of innate and adaptive immune responses. Therefore, chronic excessive glucocorticoids might hamper the initial response to external agents and the consequent activation of adaptive responses. Subsequently, a decrease in the number of B-lymphocytes and T-lymphocytes, as well as a reduction in T-helper cell activation might favour opportunistic and intracellular infection. As a result, an increased risk of infection is seen, with an estimated prevalence of 21–51% in patients with Cushing’s syndrome. Therefore, despite the absence of data on the effects of COVID-19 in patients with Cushing’s syndrome, one can make observations related to the compromised immune state in patients with Cushing’s syndrome and provide expert advice for patients with a current or past history of Cushing’s syndrome.

Fever is one of the hallmarks of severe infections and is present in up to around 90% of patients with COVID-19, in addition to cough and dyspnoea. However, in active Cushing’s syndrome, the low-grade chronic inflammation and the poor immune response might limit febrile response in the early phase of infection. Conversely, different symptoms might be enhanced in patients with Cushing’s syndrome; for instance, dyspnoea might occur because of a combination of cardiac insufficiency or weakness of respiratory muscles. Therefore, during active Cushing’s syndrome, physicians should seek different signs and symptoms when suspecting COVID-19, such as cough, together with dysgeusia, anosmia, and diarrhoea, and should be suspicious of any change in health status of their patients with Cushing’s syndrome, rather than relying on fever and dyspnoea as typical features.

The clinical course of COVID-19 might also be difficult to predict in patients with active Cushing’s syndrome. Generally, patients with COVID-19 and a history of obesity, hypertension, or diabetes have a more severe course, leading to increased morbidity and mortality. Because these conditions are observed in most patients with active Cushing’s syndrome, these patients might be at an increased risk of severe course, with progression to acute respiratory distress syndrome (ARDS), when developing COVID-19. However, a key element in the development of ARDS during COVID-19 is the exaggerated cellular response induced by the cytokine increase, leading to massive alveolar–capillary wall damage and a decline in gas exchange. Because patients with Cushing’s syndrome might not mount a normal cytokine response, these patients might parodoxically be less prone to develop severe ARDS with COVID-19. Moreover, Cushing’s syndrome and severe COVID-19 are associated with hypercoagulability, such that patients with active Cushing’s syndrome might present an increased risk of thromboembolism with COVID-19. Consequently, because low molecular weight heparin seems to be associated with lower mortality and disease severity in patients with COVID-19, and because anticoagulation is also recommended in specific conditions in patients with active Cushing’s syndrome, this treatment is strongly advised in hospitalised patients with Cushing’s syndrome who have COVID-19. Furthermore, patients with active Cushing’s syndrome are at increased risk of prolonged duration of viral infections, as well as opportunistic infections, particularly atypical bacterial and invasive fungal infections, leading to sepsis and an increased mortality risk, and COVID-19 patients are also at increased risk of secondary bacterial or fungal infections during hospitalisation. Therefore, in cases of COVID-19 during active Cushing’s syndrome, prolonged antiviral treatment and empirical prophylaxis with broad-spectrum antibiotics should be considered, especially for hospitalised patients (panel ).

Panel

Risk factors and clinical suggestions for patients with Cushing’s syndrome who have COVID-19

Reduction of febrile response and enhancement of dyspnoea

Rely on different symptoms and signs suggestive of COVID-19, such as cough, dysgeusia, anosmia, and diarrhoea.

Prolonged duration of viral infections and susceptibility to superimposed bacterial and fungal infections

Consider prolonged antiviral and broad-spectrum antibiotic treatment.

Impairment of glucose metabolism (negative prognostic factor)

Optimise glycaemic control and select cortisol-lowering drugs that improve glucose metabolism. Hypertension (negative prognostic factor) Optimise blood pressure control and select cortisol-lowering drugs that improve blood pressure.

Thrombosis diathesis (negative prognostic factor)

Start antithrombotic prophylaxis, preferably with low-molecular-weight heparin treatment.

Surgery represents the first-line treatment for all causes of Cushing’s syndrome, but during the pandemic a delay might be appropriate to reduce the hospital-associated risk of COVID-19, any post-surgical immunodepression, and thromboembolic risks. Because immunosuppression and thromboembolic diathesis are common Cushing’s syndrome features, during the COVID-19 pandemic, cortisol-lowering medical therapy, including the oral drugs ketoconazole, metyrapone, and the novel osilodrostat, which are usually effective within hours or days, or the parenteral drug etomidate when immediate cortisol control is required, should be temporarily used. Nevertheless, an expeditious definitive diagnosis and proper surgical resolution of hypercortisolism should be ensured in patients with malignant forms of Cushing’s syndrome, not only to avoid disease progression risk but also for rapidly ameliorating hypercoagulability and immunospuppression; however, if diagnostic procedures cannot be easily secured or surgery cannot be done for limitations of hospital resources due to the pandemic, medical therapy should be preferred. Concomitantly, the optimisation of medical treatment for pre-existing comorbidities as well as the choice of cortisol-lowering drugs with potentially positive effects on obesity, hypertension, or diabates are crucial to improve the eventual clinical course of COVID-19.

Once patients with Cushing’s syndrome are in remission, the risk of infection is substantially decreased, but the comorbidities related to excess glucocorticoids might persist, including obesity, hypertension, and diabetes, together with thromboembolic diathesis. Because these are features associated with an increased death risk in patients with COVID-19, patients with Cushing’s syndrome in remission should be considered a high-risk population and consequently adopt adequate self-protection strategies to minimise contagion risk.

In conclusion, COVID-19 might have specific clinical presentation, clinical course, and clinical complications in patients who also have Cushing’s syndrome during the active hypercortisolaemic phase, and therefore careful monitoring and specific consideration should be given to this special, susceptible population. Moreover, the use of medical therapy as a bridge treatment while waiting for the pandemic to abate should be considered.

Acknowledgments

RP reports grants and personal fees from Novartis, Strongbridge, HRA Pharma, Ipsen, Shire, and Pfizer; grants from Corcept Therapeutics and IBSA Farmaceutici; and personal fees from Ferring and Italfarmaco. AMI reports non-financial support from Takeda and Ipsen; grants and non-financial support from Shire, Pfizer, and Corcept Therapeutics. BMKB reports grants from Novartis, Strongbridge, and Millendo; and personal fees from Novartis and Strongbridge. AC reports grants and personal fees from Novartis, Ipsen, Shire, and Pfizer; personal fees from Italfarmaco; and grants from Lilly, Merck, and Novo Nordisk. All other authors declare no competing interests.

References

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Cushing’s syndrome in a child

Abstract

Cushing’s syndrome is a rare entity in children. Adrenal tumour is the common cause of this syndrome in young children, whereas, iatrogenic causes are more common among older children. We report a 4 year old male child diagnosed with Cushing syndrome due to a right adrenal adenoma; the child presented with obesity and increase distribution of body hair. After thorough investigation and control of hypertension and dyselectrolytemia, right adrenalectomy was performed. The patient had good clinical recovery with weight loss and biochemical resolution of Cushing’s syndrome.

1. Introduction

Cushing’s syndrome (CS) is rarely encountered in children. The overall incidence of Cushing syndrome is approximately 2–5 new cases per million people per year. Only approximately 10% of the new cases each year occur in children [1]. Unlike in adults, a male-to-female predominance have been observed in infants and young toddlers [[1][2][3]]. Although iatrogenic causes are common in children above seven years of age, adrenal causes (adenoma, carcinoma or hyperplasia) are common in children of younger age [4]. We report a 4 year old boy diagnosed with Cushing syndrome caused by a right adrenal adenoma, who had presented with obesity and increase distribution of body hair. Right adrenalectomy was performed and clinical stabilization resulted in weight loss and biochemical resolution of Cushing’s syndrome. (see Fig. 5)

2. Case report

A 4 years old boy presented with complaints of excessive weight gain of 5 months duration and increase frequency of micturition and appearance of body hair for 4 months. There was no history of any other illness, medication or steroid intake. The child was first born at term by normal vaginal delivery and birth weight of 3 kg. Physical examination revealed a chubby boy with moon face, buffalo hump, protruding abdomen, increase body hair and appearance of coarse pubic hair (Fig. 1). His intelligent quotient (IQ) was appropriate for his age and sex. His younger sibling was in good health and other family members did not have any metabolic or similar problems.

Fig. 1

Fig. 1. The child with moon face, protruded abdomen and coarse body hair.

The patient’s body length was 92cm (between -2SD to -3SD), weight 20kg (between 1 SD and 2 SD), weight for height >3SD, and BMI was 23.6 (BMI for age >3 SD). His blood pressure on right arm in lying position was 138/76 mm Hg (above 99th percentile for height and age).

Investigations: Morning 8am serum cortisol level – 27.3 μg/dl (normal: 6–23 μg/dl).

with a concurrent plasma ACTH level of < 5 pg/ml (n value < 46 pg/ml).

His serum cortisol following low dose dexamethasone suppression test (1mg dexamethasone at 11pm) at 8 am next morning was 22.1 μug/dl and his 24 hours urine catecholamine fraction was within normal limit.

HB % — 10.3 gm/dl; LDDST — 25 μg/dl; FBS — 106 mg/dl.

Serum Na+ – 140.6mmol/l; K+ – 2.83mmol/l; Ca+ – 8.7 mg/dl.

S. Creatinine −0.3 mg/dl.

Ultrasonography of abdomen revealed a heterogenous predominantly hypoechoic right supra renal mass. Contrast enhanced CT abdomen revealed well defined soft tissue density lesion (size −5.2 cm × 5.2 cm x 5.7cm) in right adrenal gland with calcifications and fat attenuations showing mild attenuation on post contrast study (Fig. 2).

Fig. 2

Fig. 2. CECT shows right adrenal mass with calcification and mild attenuation on post-contrast study.

The child was started on oral amlodipine 2.5mg 12hourly; after 5days blood pressure became normal. For hypokalemia oral potassium was given @20 meq 8 hourly and serum potassium value became normal after 4 days. Right laparoscopic adrenalectomy was planned. but due to intra operative technical problems it was converted to an open adrenalectomy with right subcostal incision. A lobulated mass of size 9 cm × 5 cm x 4 cm with intact capsule was excised. The tumour weighed 230 gm. There was no adhesion with adjacent organs, three regional nodes were enlarged but without any tumour tissue. Inferior vena cava was spared. Histopathology report was consistent with adrenal adenoma (Fig. 3) (see Fig. 4).

Fig. 3

Fig. 3. Cut section of tumour shows fleshy mass with fatty tissue.

Fig. 4

Fig. 4. Microphotograph (100 × 10) showing intact capsule and adrenal tumour cells, which are larger in size with nuclear pleomorphism, inconspicuous nucleoli, cytoplasm of the tumour cells are abundant, eosinophilic and vacuolated.

Fig. 5

Fig. 5. Physical appearance 4 months after adrenalectomy.

Post operative management: during post operative period hypokalemia and flaxuating blood sugar level was managed with oral potassium and oral glucose supplement. patient developed mild cough and respiratory distress on post op day 2, it was managed with salbutamol nebulization and respiratory physio therapy. Patient developed minor ssi and discharged on 10 th post operative day with oral prednisolone supplementation.

Follow up: the patient was followed up 2week after discharge and then every monthly, the oral prednisolone was gradually tapered and completely withdrawn on 2nd month after surgery.The patient experienced no post-surgical complications. After 4 months of surgery he reduces 6 kgs of his body weight with BMI of 16.5 (between median and 1SD) & BP 100/74 mm hg (within normal range), the moon face, buffalo hump, central obesity disappeared, morning 8am serum cortisol level was found within normal range 14 μg/dl (n value 6–23 μg/dl).

3. Discussion

Cushing’s syndrome is caused by prolonged exposure to supraphysiological levels of circulating glucocorticoids, which may be endogenously or exogenously derived. During infancy, CS is usually associated with McCune-Albright syndrome; adrenocortical tumours most commonly occur in children under four years of age and Cushing’s disease (ACTH dependent) is the commonest cause of CS after five years of age [5]. Primary adrenocortical tumours (ACTs) account for only 0.3–0.4% of all childhood neoplasms. Almost a third of these tumours manifests as Cushing syndrome and over 70% of the unilateral tumours in young children are often malignant [2,3,6,7]. There seems to be a bimodal incidence of these tumours, with one peak at under 5 years of age and the second one in the fourth or fifth decades of life. ACTs may be associated with other syndromes, such as, Li-Fraumeni syndrome, Beckwith-wiedemann syndrome, isolated hemihypertrophy, or even a germline point mutation of P53 tumour suppressor gene as reported in a series from Brazil [8]. In comparison to adult CS, growth failure with associated weight gain is one of the most reliable indicators of hypercortisolaemia in pediatric CS. The parents often fail to notice facial changes and growth failure and hence the diagnosis is often delayed. In one study, the mean time from appearing symptoms to diagnosis in 33 children with Cushing’s disease was 2.5 years [5]. More recently the comparison of height and BMI SDS measurements provided a sensitive diagnostic discriminator in pediatric patients with CD and those with simple obesity [9]. In the present case, the parents observed noticeable changes in his face and presence of body hair, which made them to bring the child to medical attention. A review of 254 children on the International Pediatric Adrenocortical Tumour Registry identified virilization as the most common manifestation [10]. About 10% of the tumours can be non-functional at presentation, and approximately one third of pediatric patients present with hypertension. Majority of patients (192/254) in the Registry had localized disease and metastatic disease was found in less than 5% of cases. Older children with CS or mixed androgen and cortisol secreting adrenocortical tumours had a worse prognosis compared to younger children [10]. The present case had mild hypertension as well as dyselectrolytemia at presentation, which could be controlled with medication. He had a single adenoma confined to the adrenal gland and there was no evidence of malignancy. After surgical excision of the tumour and the right adrenal gland, the patient made rapid improvement in clinical condition and has been on follow up for last 7 months.

4. Conclusion

Pediatric adrenocortical tumours (ACTs) are most commonly encountered in females and in children less than four years. But our case being an 4-year-old boy forms a rare presentation of endogenous Cushing’s syndrome due to adrenal adenoma. Cushing’s syndrome in this child was controlled after right adrenalectomy.

Patient consent

Informed written consent was taken.

Funding

No funding or grant support.

Authorship

All authors attest that they meet the current ICMJE criteria for authorship.

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

References

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