Lipoleiomyoma of the reproductive tract in a Huntaway bitch

Abstract CASE HISTORY: A marked perineal swelling was identified in a 4-year-old entire nulliparous Huntaway bitch. The mass was first observed at last oestrus, 6 months previously. CLINICAL FINDINGS: A diffuse swelling was visible in the perineum that extended from the anus to the vulva. The vulval commisure was distorted ventrolaterally. An extraluminal mass involved the vulva, vestibule and vagina. On rectal and vaginal examination the rostral extent could not be identified. There was no palpable intraluminal mass. The bitch produced a reduced urine flow, and there was complete voiding of the bladder. The urethra was not involved. Vaginal cytology suggested pro-oestrus. PATHOLOGICAL FINDINGS: Multiple fine-needle aspirates were non-diagnostic. Incisional biopsies revealed extensive well-differentiated fatty tissue with scattered bundles of collagen and occasional fascicles of smooth muscle. Following complete excisional biopsy the formalin-fixed neoplasm weighed 714 g and measured 13 x 11 x 6 cm. Histo...