The authors present a case report of an atypical liver vascular malformation in a cat. The lesion was diagnosed first by ultrasound, fine needle aspiration and computed tomographic examination, which revealed the presence of a thin-walled single echogenic oval structure in the caudate lobe of the liver without visible flow in Doppler examination and with content similar to blood. The echogenicity of the lesion was variable, which depended on its size and time after aspiration. Initially, atypical haemangioma was suspected. After surgical removal, histopathological examinations were performed. The final diagnosis was a benign angioproliferative lesion.