Left-sided inferior vena cava.

To cite: Matsunaga M, Fukahori M, Ushijima T, et al. BMJ Case Rep Published online: [please include Day Month Year] doi:10.1136/bcr-2015211268 DESCRIPTION A middle aged man underwent sigmoidectomy and hepatic metastasis resection for sigmoid cancer and hepatic metastases, respectively. Subsequently, hepatic arterial infusion therapy was performed for recurrence after the hepatic metastasis resection. However, no local control was obtained, and metastasis occurred at a site other than the liver, namely, the diaphragm. Therefore, the patient was referred to our department for systemic chemotherapy. Abdominal CT performed on referral to our department (figures 1 and 2) showed the left-sided inferior vena cava ascending on the left side of the abdominal aorta. The left and right common iliac veins joined together and formed the left-sided inferior vena cava running to the right side of the abdominal aorta with the left and right renal veins. Sigmoidectomy was performed without any intraoperative problems, and the left-sided inferior vena cava did not show any symptoms. The left-sided inferior vena cava, which was accidentally detected with sigmoid cancer, is a relatively rare anomaly 2 and a considerably interesting imaging finding.