Ovarian Steroid Cell Tumor Resembling Luteoma Associated with Hyperadrenocorticism (Cushing's Disease) in a Dog

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Abstract
An ovarian steroid cell tumor was diagnosed in a 6.5-year-old female Rottweiler. The animal was polydipsic and polyuric, with an enlarged, pot-bellied abdomen. Radiographs and ultrasound examinations revealed an approximately 13-cm-diameter cystic mass below the right kidney. A low-dose dexamethasone suppression test was consistent with hyperadrenocorticism. Surgical exploration revealed an enlarged, lobulated left ovary approximately 10 cm in diameter, weighing 550 gs. Histologically, the ovarian tumor consisted of dense sheets and nests of round to polyhedral cells with abundant, finely vesiculated cytoplasm. The overall features were most consistent with ovarian steroid cell tumor resembling luteoma and associated with hyperadrenocorticism.

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