Primary Uterine Hemangiosarcoma in a Thoroughbred: A Case Report

Uterine haemangiosarcoma in a Netherland Dwarf rabbit (Oryctolagus cuniculus Netherland dwarf)

A 7-year-old intact Netherlands Dwarf rabbit with bloody discharge from the vulva underwent ovariohysterectomy. Grossly, both sides of the uterus were enlarged. Histologically, the tumour had formed protruded from the myometrial wall toward the serosa and was composed of irregular small capillaries with irregularly shaped structures and bundled proliferation of spindle-shaped cells. No tumour cells infiltrated the endometrium. The tumour cells were positive for CD31, and histological and immunohistochemical staining confirmed the diagnosis of haemangiosarcoma. Vascular tumours in the uterus of animals are uncommon, and only one case has been reported in the uterus of rabbits.

Disseminated Hemangiosarcoma in a Mare Mule

An 8-year-old mare mule was presented with a facial mass and history of anorexia, unilateral epistaxis and purulent nasal discharge. The facial mass was encountered from the ventral to the lateral right canthus of the eye up to the facial crest. Thoracic ultrasonography showed five rounded masses. A standing CT under sedation was performed revealing a huge extension and infiltration on surrounding tissues. Due to the extension, type of lesions, outcome and suspicion of metastasis, the owner chose to euthanize the patient. Necropsy confirmed the presence of tumoral lesions spread into the lungs, spleen, adrenal glands, ovary, oral cavity, and right frontal sinus. The microscopic examination was consistent with hemangiosarcoma. Hence, hemangiosarcoma is a differential diagnosis to rule out  in future similar cases. This clinical description did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.