OVARIAN-STEROID CELL TUMOR RESEMBLING LUTEOMA ASSOCIATED WITH HYPERADRENOCORTICISM (CUSHINGS-DISEASE) IN A DOG

An ovarian steroid cell tumor was diagnosed in a 6.5-year-old female R ottweiler. The animal was polydipsic and polyuric, with an enlarged, p ot-bellied abdomen. Radiographs and ultrasound examinations revealed a n approximately 13-cm-diameter cystic mass below the right kidney. A l ow-dose dexamethasone suppression test was consistent with hyperadreno corticism. Surgical exploration revealed an enlarged, lobulated left o vary approximately 10 cm in diameter, weighing 550 gs. Histologically, the ovarian tumor consisted of dense sheets and nests of round to pol yhedral cells with abundant, finely vesiculated cytoplasm. The overall features were most consistent with ovarian steroid cell tumor resembl ing luteoma and associated with hyperadrenocorticism.