FRI208 Treating Pheochromocytoma For Glycemic And Blood Pressure Control

Disclosure: A.M. Santiago Carrion: None. A.N. Gonzalez Bossolo: None. Pheochromocytomas are catecholamine-secreting tumors of the adrenal medulla chromaffin cells. They account for 0.2-0.6% of hypertension (HTN) in patients of general outpatient clinics. In addition, is known that this excess of catecholamine production is associated with impaired insulin release from pancreatic beta-cells leading to hyperglycemia. However, pheochromocytoma as a cause of diabetes and HTN is frequently overlooked. A 60-year-old woman with medical history of arterial HTN and type 2 diabetes mellitus since 10 years ago was referred to the Endocrine clinic by Nephrology for glycemic control. Her medical regimen consisted of linagliptin 5mg daily, metformin 1000mg twice daily, insulin glargine 40 units daily, losartan 50mg twice daily, amlodipine 10mg daily and hydrochlorothiazide 25mg daily. Physical examination was unremarkable, including adequate vital signs with blood pressure 110/64 mmHg and heart rate 93/min. Laboratories were notable for glycated hemoglobin 8.7%, fasting blood glucose 118 mg/dL, and urine albumin-creatinine ratio (UACR) 4622 mg/g with adequate glomerular filtration rate. Upon further investigation of nephrotic-range proteinuria, patient was incidentally found with a right adrenal mass on ultrasound, which was confirmed to have absent signal dropout on MRI and measured 5 cm. On retrospective, patient revealed feeling episodic palpitations, diaphoresis, and occasional headaches which she attributed to menopausal symptoms. Plasma free metanephrines were negative, but free normetanephrines were elevated at 2160 pg/mL (range <148 pg/mL). Patient underwent successful right adrenalectomy and pathology confirmed a right 5 cm pheochromocytoma with negative margins. Unfortunately, she wished to defer genetic testing. Four weeks after surgery, plasma normetanephrines fell to normal levels 141.8 pg/mL. Furthermore, patient was able to wean off basal insulin completely and HTN remained controlled with losartan monotherapy. Glycated hemoglobin improved to 6.7%. Additionally, UACR improved to 1352.94 mg/g and empagliflozin was added to avoid diabetic kidney progression. In this case we presented a patient with common comorbidities encountered in the clinic, but with an unusual etiology. Moreover, this patient presented with nephrotic-range proteinuria that has significantly improved after removal of the tumor, which has only been seen in case reports. Some authors propose a possible immunological pathogenesis or glomerular hyperfiltration. Detection of resistant HTN should had prompted earlier detection of pheochromocytoma in this patient. As physicians, we should be aware of endocrine causes of diabetes and HTN, such as Cushing syndrome, Acromegaly, Primary Aldosteronism, and Pheochromocytoma and Paraganglioma, as treating these may lead to better quality of life, and less disease-related complications and polypharmacy. Presentation: Friday, June 16, 2023