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Mammary carcinoma in a melengestrol acetate (MGA) contracepted tiger.
S3a. Multiple raised pink to tan mammary masses with ulceration of the overlying skin. S3b. Multiple histologic patterns are common in mammary gland carcinomas. In this case, there are areas of comedone, solid and tubular growth separated by small amounts of fibrous stroma. Intratubular inflammation and necrotic debris is also present.
(Photos courtesy of the Wildlife Conservation Society)
