A Case of Plasma Cell Neoplasm and Uterine Fibroid in Capybara

Abstract

Capybara （Hydrochoerus hydrochaeris） kept at an animal exhibition facility presented anorexia and wobble of hind limbs, and died. Blood test showed anemia and hyperproteinemia. Gross necropsy examination revealed swelling heart and kidneys, and a free mass in the uterus. Histopathological examination demonstrated infiltration of plasmacytoid tumor cells into heart, liver, kidneys, and adrenal glands. The mass in the uterus was diagnosed as a leiomyoma composed of spindle-shaped cells. Based on these findings, the case was considered to have died due to plasma cell neoplasm and uterine necrosis caused by uterine fibroid.