Based on histological, special stains, and immunohistochemical examination, it was shown that one of the masses was composed of large, ovoid and polyhedral neoplastic mesenchymal cells with eosinophilic cytoplasm and a few binucleated cells surrounded by collagen fibres. Later in November 2019, the patient died and necropsy confirmed the presence of two uterine masses one was located at the cervico-uterine junction and another in the uterine body, with pyometra, and cystic endometrial hyerplasia. Soon after, an open pyometra was confirmed. An ultrasonography suggested the presence of multiple reproductive lesions, including two uterine masses which were suspected to be leiomyomas. Following its capture in March 2014, an adult female Sumatran rhinoceros frequently showed profuse vaginal bleeding.
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