Thangapandiya, MSelvaraj, JPreetha, SPGayathri Devi, RTANUVAS2020-06-012020-06-012011-12http://krishikosh.egranth.ac.in/handle/1/5810146786TNV_IJAR_2011_45(4)322-323Necropsy examination was conducted on two adult female Wistar rats, aging 16 and 18 months that were presented with a history of a gradually increasing mass in their lower abdominal region. Gross examination revealed firm, hard, localized, well-encapsulated masses in the inguinal pair of the mammary glands. Microscopically, the acinar structures were surrounded by distinct interlobular and intralobular connective tissues. Acini were of varying shapes and sizes and irregularly placed among the fibrous stroma. The histological pattern and the nature of the tumour in older female rats were sufficient to confirm the diagnosis as mammary fibroadenomas.enArticle