Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: Mammary fibroadenoma in a lamb | J. Vet. Sci. 2007 8 4 423-425 JOURNAL OF Case Report Veterinary Science Mammary fibroadenoma in a lamb rtnHiQÌ QI-1 TolíTQ Cnvpní1 Ml 1 r R R . y iilrcpl . lavuz juibanai ỉolga juvenc ivrurar laiiin lonca J. vabak lu ssel sozgerr Department of Pathology Faculty of Veterinary Medicine University of Ondokuz Mayis 55139 Kurupelit Samsun Turkey 2Veterinary Provincial Directorate 20770 Baklan Denizli Turkey A fibroadenoma was diagnosed in the left udder of a 3-month-old female Chios lamb. No recurrence was observed after surgery. Grossly the tumor had a whitish-gray lobular appearance and the lobules were interlaced with thin septa. Microscopically the tumor was composed of proliferating fibroepithelial tissue including differentiated ducts lined by whorls and interlacing bundles of abundant loose fibrovascular stroma. Immunohistochemistry revealed the ductal epithelium to be positive for pan-cytokeratin AE1 AE3 and loose fibrovascular stroma was positive for vimentin and basal cells covering the ductal epithelium of alpha-smooth-muscle actin. Immunostaining for the estrogen and progesterone receptors was negative. A diagnosis of mammary fibroadenoma was made based on the histological and immunohistochemical findings. Key words fibroadenoma lamb mammary gland ovine tumor A mammary fibroadenoma is a benign tumor consisting of a mixture of luminal epithelial and stromal cells and sometimes admixed with myoepithelial cells. It is fairly common in cats and dogs 6 . However spontaneous mammary tumors in goats sheep and horses are extremely rare 5 and a fibroadenoma has been reported only in one young Holstein cow 4 and a heifer 10 . To our knowledge there are no reports of an ovine mammary fibroadenoma in the veterinary literature. We report the first case of mammary fibroadenoma in a young lamb. A 3-month-old female Chios lamb presented with the progressive tumoral enlargement of the left udder since 1 month of age. The tumoral mass 15 X 13 X 13 cm was well- .
