SAT249 Femur Lysis Calcium Crisis

Disclosure: G. Gupta: None. S. Idriss: None. N. Barua: None. J. Hodge: None. I. Jamal: None. Introduction: Primary hyperparathyroidism usually presents with symptoms of bone pain, fatigue, polyuria, constipation, and nephrolithiasis. Here we describe a 27-year-old female with a femoral neck fracture and found to have a parathyroid mass. Case: 27 y/o female with autism spectrum, presented to the ED for evaluation of a mechanical fall and was found to have a left femur and pubic ramus fracture. On arrival she was vitally stable, labs were significant for parathyroid hormone-related hypercalcemia corrected Ca 14.8 mg/dL, PTH 911 peaked to 2884 pg/mL, vit D level of 12.7 ng/mL, phosphorus of 2.3 mg/dL. Trauma workup revealed numerous osseous lytic lesions lower extremities. Review of system was negative except for localized pain at fracture site. Family history negative for hypercalcemia or hyperparathyroidism. She was managed with IV fluids, IV Zoledronic Acid 4 mg, SC calcitonin 240 units, and 50K IU D3. During hospitalization, she needed re-dozing with Zoledronic acid and Cinacalcet due to recurrence of significant hypercalcemia, warranting further imaging. CT neck showed mandibular and maxillary bone lesions raising suspicion of hyperparathyroidism jaw tumor syndrome (HPT-JT) vs brown tumors, 3.1 cm lobular mass inferior to the right thyroid lobe suspicious for large parathyroid adenoma vs carcinoma, and other multiple enlarged parathyroids. She underwent left femur cephalomedullary nailing and prophylactic nailing for the impending right femur fracture. Bone pathology showed fragmented bone, adipose, and skeletal muscle with fibrinous debris. She underwent subtotal parathyroidectomy (4-1/2 glands) and intraoperative PTH level declined from 1537 to 75 pg/mL 15 minutes after removal. Pathology showed tissue consistent with multi glandular parathyroid disease without evidence of malignancy. Postop her course was complicated with hungry bone syndrome requiring a few weeks on IV calcium. Discussion: Pathologic conditions in primary hyperparathyroidism include single adenomas (80-90% of the time), multiglandular hyperplasia multiple-gland (three or more glands) accounting for approximately 6%, and parathyroid carcinomas account for 1-2% of cases. Other conditions as with primary hyperparathyroidism include Familial hyperparathyroidism such as MEN 1 & 2A, Familial isolated hyperparathyroidism, and Familial HPT-JT syndrome, previously termed familial cystic parathyroid adenomatosis. Interestingly our pt had multiglandular hyperplasia which is a less common cause, she also demonstrated jaw lesions but didn’t fulfill the criteria for HPT-JT. Conclusion: Our patient had an unusual presentation of large bone fracture and multiple lytic lesions likely representing a brown tumor of the bone due to primary hyperparathyroidism. Most patients with lytic lesions have malignancy, however, endocrine pathologies should also be considered. Presentation: Saturday, June 17, 2023