SAT189 Giant Parathyroid Adenoma

Disclosure: S. Shah: None. P. Fujikawa: None. Parathyroid adenomas rarely weigh more than 4 grams. Our patient had a 5.3gram adenoma causing bilateral knee pain limiting mobility, constipation, low back pain, and frontal headache. Presenting with calcium of greater than 17 mg/dL, patient was treated with 2 rounds of hemodialysis, calcitonin, Zoledronate, and aggressive IV hydration to decrease calcium levels prior to parathyroidectomy. Patient then went onto develop Hungry bone syndrome which was treated with calcium carbonate and calcitriol. This rare giant parathyroid adenoma presents a unique opportunity to learn about pathogenesis and treatment of longstanding hyperparathyroidism causing hypercalcemia associated symptoms and hungry bone syndrome after parathyroidectomy. Presentation: Saturday, June 17, 2023