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Summary
Multiple endocrine neoplasia type 1 (MEN1) requires a high level of suspicion, and late diagnosis can lead to dire outcomes. Genetic counselling is an important part of management, with a lack of evidence surrounding an optimal approach in Aboriginal Australian populations. Our case surrounds a remote-dwelling 48-year-old Aboriginal Australian female who was reviewed by an inpatient endocrine team in 2020 for persistent hypercalcaemia on a background of a parathyroidectomy in 2011 for primary hyperparathyroidism (PHPT), while she was admitted to a local hospital for acute chronic abdominal pain. Relevant medical history included multiple pulmonary embolisms/deep vein thrombosis, myocardial infarction, atrial fibrillation, chronic thromboembolic pulmonary hypertension, right heart failure, human T-lymphotropic virus 1, recurrent abdominal pain, and gastro-oesophageal reflux disorder. Gastroscopies from 2013 and 2015 demonstrated chronic gastritis with hundreds of gastric polyps. Subsequent laboratory studies, neuroendocrine tumour (NET) screening, and CT imaging demonstrated a recurrence of PHPT and a new diagnosis of Zollinger–Ellison syndrome. A 68-gallium-DOTATATE PET/CT was in keeping with metastatic NET. Pituitary studies were normal. Genetic testing confirmed a rare heterozygous variant of c.207dupC in exon 2 of the MEN1 gene. Treatment was symptom based due to terminal comorbidities. Genetic counselling was attempted; however, cultural and logistical barriers were identified and the family declined further testing. Unfortunately, she died in 2021 from multifactorial respiratory failure. This case highlights the need for better approaches to genetic counselling systems for remote Aboriginal Australians and emphasizes the importance of early recognition and the challenges faced in remote areas in making such rare diagnoses.
Learning points
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Remote healthcare systems often lack access to adequate specialist care, resulting in delayed diagnosis of rare conditions and leading to morbidity and mortality.
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Further research and work need to be done to provide culturally appropriate genetic counselling systems in remote Aboriginal Australians.
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A high index of suspicion is required to diagnose MEN1.
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Consider MEN1 in any patient diagnosed with primary hyperparathyroidism, with age <40, and/or with the presence of multiglandular disease or with the presence of Zollinger–Ellison syndrome.
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MEN1 may be under-recognized in Aboriginal Australians.
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Department of Biomedical Informatics, University of Colorado, Aurora, Colorado, USA
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Summary
Multiple endocrine neoplasia type 2 (MEN2) is a hereditary cancer syndrome caused by germline-activating pathogenic variants in the RET proto-oncogene. MEN2A is the most common subtype, with a risk for medullary thyroid cancer (MTC), pheochromocytoma (PHEO), and primary hyperparathyroidism (PHPT), whereas MEN2B is less common and associated with MTC and PHEO along with mucosal neuromas. Little is known about the specific RET germline heterozygous variant K666N. This variant has been described in very few families, and in most cases, patients were diagnosed with a very indolent MTC as the only feature. There is one case of MTC and bilateral PHEO. The RET K666N variant is not stratified yet by the American Thyroid Association, and data are limited on pathogenicity; therefore, appropriate screening and treatment of asymptomatic RET K666N carriers are unclear. Here, we report a family with a heterozygous germline RET K666N variant. The proband was identified when she experienced cardiogenic shock and multi-organ failure after an elective hysterectomy and subsequently was found to have PHEO, with genetic testing revealing the RET K666N germline variant. Patient consent was obtained through IRB protocol COMIRB #15-0516.
Learning Points
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The specific RET germline heterozygous variant K666N is rare and described in very few families, and in most cases, patients were diagnosed with a very indolent MTC as the only feature. Our proband is much younger and has PHEO, MTC, and PHPT.
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The RET K666N germline variant appears to be a low penetrance variant for MEN2.
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Cancer Genetics Laboratory, Kolling Institute of Medical Research, New South Wales, Sydney, Australia
Faculty of Medicine and Health, University of Sydney, New South Wales, Sydney, Australia
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Cancer Genetics Laboratory, Kolling Institute of Medical Research, New South Wales, Sydney, Australia
Faculty of Medicine and Health, University of Sydney, New South Wales, Sydney, Australia
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Summary
Pregnancy in the setting of metastatic paraganglioma is challenging, particularly in the context of tyrosine kinase use. We describe a 26-year-old female with a background of metastatic paraganglioma harboring a pathogenic SDHB variant, requiring sunitinib, which was withheld to facilitate the safe conception and delivery of a healthy baby. She required no alpha- or beta-blockade during her pregnancy and exhibited no signs of tumor progression or symptoms throughout this period. Historically, higher rates of fetal and maternal morbidity and mortality have been experienced in the setting of pregnancy. Although limited data exist on the management of metastatic paraganglioma in pregnant patients, this case suggests that careful treatment modifications, such as temporary tyrosine kinase therapy cessation and vigilant monitoring, can result in successful pregnancies without compromising maternal or fetal well-being.
Learning points
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Paraganglioma in pregnancy has been associated with poor fetal and maternal morbidity and mortality.
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Many of the treatment modalities for metastatic paraganglioma, including tyrosine kinase inhibitors, can affect fertility or cannot be utilized in pregnancy, necessitating the temporary suspension of these treatments.
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This case exemplifies that careful clinical and biochemical monitoring during pregnancy is required to avoid maternal and fetal harm while balancing the risk of disease progression off treatment.
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Western Health, Melbourne, Victoria, Australia
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Australian Centre for Accelerating Diabetes Innovations, University of Melbourne, Victoria, Australia
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Summary
Congenital hyperinsulinism is the leading cause of persistent hypoglycaemia in infants and children; however, it is uncommon to be diagnosed in adulthood. We describe the cases of two sisters who presented with hyperinsulinaemic hypoglycaemia aged 47 and 57 years old, who were subsequently diagnosed with compound heterozygous likely pathogenic variants in the ABCC8 gene, a known cause of monogenic congenital hyperinsulinism. We discuss the typical presenting features, investigation findings, and treatment strategies for patients with this condition.
Learning Points
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Congenital hyperinsulinism is a rare cause of hyperinsulinaemic hypoglycaemia diagnosed in adulthood.
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Clinical presentation is similar to an insulinoma, and imaging modalities may assist in differentiation.
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There are minimal medical therapies currently available for patients non-responsive to diazoxide (such as those with ABCC8 and KCNJ11 variants).
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Continuous glucose monitoring can be helpful in giving patients autonomy in managing their disease, as well as relieving anxiety and fear associated with hypoglycaemia.
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St Vincent’s Clinical School, University of New South Wales, Sydney, Australia
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Cancer Genetics Unit, Kolling Institute of Medical Research, Sydney, Australia
Northern Clinical School, University of Sydney Faculty of Medicine and Health, Sydney, Australia
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Department of Anatomical Pathology, Royal North Shore Hospital, Sydney, Australia
Cancer Diagnosis and Pathology Group, Kolling Institute of Medical Research, Sydney, Australia
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Cancer Genetics Unit, Kolling Institute of Medical Research, Sydney, Australia
Northern Clinical School, University of Sydney Faculty of Medicine and Health, Sydney, Australia
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Summary
RET mutations are implicated in 60% of medullary thyroid cancer (MTC) cases. The RET-selective tyrosine kinase inhibitor selpercatinib is associated with unprecedented efficacy compared to previous multi-kinase treatments. Langerhans cell histiocytosis (LCH) is a clonal histiocytic neoplasm usually driven by somatic BRAF mutations, resulting in dysregulated MAPK signalling. We describe a 22-year-old woman with metastatic MTC to regional lymph nodes, lung and liver. Tumour tissue harboured a somatic pathogenic RET variant p.(M918T) and selpercatinib was commenced. She experienced sustained clinical, biochemical and radiological responses. Two years later, she developed rapidly progressive apical lung nodules, prompting biopsy. Histopathology demonstrated LCH with a rare BRAF variant p.(V600_K601>D). The lung nodules improved with inhaled corticosteroids. We hypothesize that selective pressure from RET blockade may have activated a downstream somatic BRAF mutation, resulting in pulmonary LCH. We recommend continued vigilance for neoplasms driven by dysregulated downstream MAPK signalling in patients undergoing selective RET inhibition.
Learning points
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Patients with RET-altered MTC can experience rapid disease improvement and sustained disease stability with selective RET blockade (selpercatinib).
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LCH is a clonal neoplasm driven by MAPK activation, for which the most common mechanism is BRAF mutation.
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Both MTC and pulmonary LCH are driven by dysregulated MAPK signalling pathway activation.
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We hypothesise that the RET-specific inhibitor selpercatinib may have caused the activation of dormant LCH secondary to selective pressure and clonal proliferation.
Department of Endocrinolgy and Diabetes, Cairns Hospital, Cairns, Queensland, Australia
Cairns Diabetes Centre, Cairns, Queensland, Australia
Gold Coast Hospital and Health Service, Gold Coast, Cairns, Queensland, Australia
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Department of Endocrinolgy and Diabetes, Cairns Hospital, Cairns, Queensland, Australia
Cairns Diabetes Centre, Cairns, Queensland, Australia
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Department of Endocrinolgy and Diabetes, Cairns Hospital, Cairns, Queensland, Australia
Cairns Diabetes Centre, Cairns, Queensland, Australia
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Department of Endocrinolgy and Diabetes, Cairns Hospital, Cairns, Queensland, Australia
Cairns Diabetes Centre, Cairns, Queensland, Australia
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Department of Surgery, Cairns Hospital, Cairns, Queensland, Australia
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Summary
A 48-year-old Asian male, presented to the hospital for an elective total thyroidectomy in the context of 6.3 cm thyroid nodule. The fine needle aspiration cytology of the nodule confirmed papillary thyroid cancer (PTC) with some atypical histiocytes. He has a history of idiopathic arginine vasopressin deficiency (AVP-D) and has been taking oral DDAVP 100 µg daily, self-adjusting the dose based on thirst and polyuria. Additionally, he also has a history of recurrent spontaneous pneumothorax. His total thyroidectomy was aborted due to significant intraoperative bleeding, and his admission was further complicated by post-operative hyponatraemic seizure. Thyroid histology revealed the diagnosis of Langerhans cell histiocytosis (LCH), and further investigation with contrast CT demonstrated multi-organ involvement of the thyroid, lungs, and bones.
Learning points
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Langerhans cell histiocytosis (LCH) is a condition that can affect one or more organ systems, including the pituitary, where it can present as AVP deficiency. Strict monitoring of fluid balance, as well as serial monitoring of serum sodium, is essential in all patients with AVP-D in the perioperative setting.
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Iatrogenic hyponatraemic seizure is an uncommon but serious complication of DDAVP treatment in hospitalised patients with AVP-D. DDAVP dosing must be carefully monitored.
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LCH with multisystem involvement is an important mimic for metastatic conditions, and histological diagnosis is essential to guide treatment and prognosis.
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Although LCH without bone marrow involvement is unlikely to increase the risk of bleeding, its effect on tissue integrity may make surgery more challenging.
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BRAF-V600E mutation is an important driver mutation and a potential therapeutic target in the treatment of LCH.
Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
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Liverpool Diabetes Collaboration, Ingham Institute of Applied Medical Research, Sydney, Australia
South West Clinical School, University of New South Wales, Sydney, Australia
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Summary
Approximately 80% of adrenal incidentalomas are benign, and development into adrenal cortical cancer is extremely rare. This is a major reason behind clinical guidelines recommending surveillance of incidentalomas for a relatively short duration of up to 5 years. Surveillance of lesions less than 1 cm is not routinely recommended. A 70-year-old lady was diagnosed with a non-hyperfunctioning 8 mm right adrenal lesion. She underwent annual biochemical and radiological assessment for 5 years before surveillance was extended to 2-yearly intervals. The lesion was stable in size, and radiological characteristics were consistent with a benign adenoma. Seven years after the initial detection of the adrenal lesion, she developed acute abdominal pain. Imaging revealed a 7 cm right adrenal lesion, which was surgically resected and histologically confirmed to be adrenal cortical cancer. She died 1 year later. Clinical guidelines have moved towards a shortened duration of surveillance of incidentalomas. Even though malignant transformation is a rare event, it is possible that this will result in a delayed diagnosis of adrenal cortical cancer, a highly aggressive malignancy with a poor prognosis. To our knowledge, this is the first published case of an adrenal lesion of less than 1 cm developing into adrenal cortical cancer.
Learning points
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Adrenal incidentalomas are increasingly common.
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Clinical practice guidelines exist to aid in differentiating benign and malignant lesions and assessing functional status.
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Transformation of adrenal incidentalomas to adrenal cortical carcinomas is a rare but recognised event.
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Keogh Institute for Medical Research, Nedlands, WA, Australia
Medical School, University of Western Australia, Nedlands, WA, Australia
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Medical School, University of Western Australia, Nedlands, WA, Australia
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Summary
We report a case of catamenial erythema multiforme major in a 46-year-old female. She was treated successfully with goserelin, a GnRH agonist, until the expected age of menopause; however, its therapeutic effects persisted for longer than expected, possibly due to accumulation in adipose tissue.
Learning points
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A group of menstrual cycle-related dermatoses and hypersensitivity syndromes exist but are rarely reported in the literature.
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A history of recurrent cutaneous eruptions in premenopausal females should be considered in the context of the menstrual cycle.
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The diagnosis of menstrual cycle-related dermatoses is largely clinical, although provocation testing can assist.
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Treatment options are broad and are aimed at reducing the immune response and/or suppressing ovulation.
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Goserelin may accumulate and have a gonadotrophin-suppressing effect for longer than expected.