Squamous Cell Carcinoma Of The Vulva And Perineum In A Katahdin Ewe

Abstract

An 8 year-old, 12 weeks pregnant, white Katahdin ewe was presented for a malodor associated with a vulvar lesion. Physical examination was unremarkable with the exception of an ulcerated, necrotic lesion involving the entire vulva and a small part of the surrounding perineum. Squamous cell carcinoma was suspected. Eight weeks after initial presentation the ewe was again presented for dystocia due to malposition of the first lamb. One deceased and two live lambs were delivered with vaginal assistance. In the four days following the dystocia the dam was lethargic, anorexic, and did not properly care for her lambs. With the visible progression of the lesion and suspected poor prognosis for future reproduction the owner decided to humanely euthanize the ewe. Necropsy confirmed squamous cell carcinoma on histopathology. Bacterial pneumonia was considered to be the cause of the ewe’s clinical signs at the time of euthanasia based on lung pathology and culture. No squamous cell carcinoma metastases were found.