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The caudal vena cava in carnivores is the blood drainage pathway, originating from the pelvis and pelvic limbs, and entering the right atrium. Caudal vena cava duplication has rarely been reported in small animals. This report aims to describe a case of duplicity of the caudal vena cava and renal vein variation in a female feline corpse of a Brazilian shorthaired cat approximately 3 years of age, with the focus on the possible clinical and surgical implications of this anatomical variation. It was subsequently preserved in 10% formalin, and its vascular system was injected with colored S-65 Petrolatex. During the dissection of the abdominal region, the presence of a double caudal vena cava and two renal veins in both kidneys was observed. While uncommon in cats, caudal vena cava duplication should be differentiated from other vascular anomalies when planning surgeries and to avoid misdiagnoses.

Duplicity of caudal vena cava and renal veins in a Brazilian shorthaired cat - a case report