• Journal of Veterinary Clinics
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• v.28 no.6
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• pp.610-612
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• 2011

A 9-years-old female Collie dog was presented with history of abdominal enlargement, anorexia and constipation. On radiographic and ultrasonographic examinations, intra-abdominal mass was identified. On cytologic findings of the mass, no cancer cell was observed. Exploratory laparotomy was performed to diagnose and remove the mass. A large, single, spheroid mass weighing 9.5 kg ($40{\times}25{\times}18$ cm) was located in the middle section of the right uterine horn. Based on the results of histopathological examination, the mass was diagnosed as a cystic endometrial hyperplasia (CEH). This is rare case of severe focal CEH without pyometra in a bitch.