RF19 | PSUN33 Adrenocortical Carcinoma as a Rare Manifestation of Birt-Hogg-Dubé Syndrome

Abstract Adrenocortical carcinoma (ACC) can occur as part of hereditary cancer syndromes, particularly Lynch syndrome and Li-Fraumeni syndrome. Here we describe 5 patients (3 women) with adrenal tumors and Birt-Hogg-Dubé syndrome (BHDS). BHDS is a hereditary tumor syndrome characterized by fibrofolliculomas/trichodiscomas, renal tumors, lung cysts, and spontaneous pneumothoraces. All five patients had a confirmed germline FLCN pathogenic variant. One case was previously reported by our institution. Age of diagnosis (AD) ranged from 36 to 62 years with a mean AD of 46 years. All patients identified as Caucasian. Three patients had non-functioning adrenal tumors, while the remaining two patients did not undergo biochemical assessment preoperatively but did not have symptoms or history of adrenal hormone excess. Histologically, four patients had confirmed ACC while one had an adrenocortical tumor of uncertain malignant potential, most consistent with an oncocytoma. All patients were initially treated with mitotane. Three patients developed metastatic disease requiring additional systemic chemotherapy, immunotherapy, and/or radiation. A total of 8 confirmed ACCs in patients with BHDS have been reported to date, raising suspicions that these tumors might be a part of the BHDS tumor spectrum. When BHDS patients are screened for renal malignancies, special attention should be paid to the adrenal glands. Adrenal nodules should undergo prompt assessment as >50% of reported cases developed metastatic disease. Given possible association with BHDS, testing for FLCN pathogenic variants should be considered during the genetic evaluation of patients with ACC. Presentation: Sunday, June 12, 2022 12:30 p.m. - 2:30 p.m., Sunday, June 12, 2022 12:54 p.m. - 12:59 p.m.