EP.TH.515A Case of mucinous adenocarcinoma of the breast in a young male patient presenting with a subcutaneous axillary lump

Abstract Aims Mucinous adenocarcinoma of the breast is rarely encountered clinically, and makes up only 0.01% Breast cancer (BC) cases < 1% male (MBC). We describe an extremely rare case mucinous carcinoma in accessory axillary tissue a male. Case details A 48-year old presented with subcutaneous lump his left axilla. Ultrasound described 30mm hypoechoic mass core biopsy confirmed adenocarcinoma, strongly positive for oestrogen progesterone receptors, HER2 negative. solitary enlarged node was sampled (C2) mammogram reported 32mm spiculate (M4) on left. PET scan showed uptake known mass. Management Wide Local Excision Sentinel Lymph Node Biopsy (SLNB) completed. Histology 27 mm grade 2 carcinoma, patient completed adjuvant radiotherapy commenced tamoxifen. Conclusions MBC rare, accounts all BC. Men tend to be diagnosed at older age (mean 67 years) usually have genetic/hormonal risk factors. Histologically, invasive ductal 95% MBC. In every regard therefore, our breaks mold since, he young, had no genetic/family history background gynaecomastia (present 6-38%). Literature review suggests that this second its kind from it we can learn vigilant as well more typical presentations.