Shojiro KODA, Kazuhiro IMURA, Kenji MATSUO, Sachio OOTSUKA

The First Department of Internal Medicine, Toho University School of Medicine

キーワード : Retroperitoneal tumor, Neurogenic sarcoma, Ultrasonogram

　A 54 year old male with cholecystolithiasis was admitted to our hospital due to fever. Ultrasonogram showed a large tumor with heterogeneous echogenicity in the right epigastrium.
　CT showed an abnormal low density area in the liver, which was well demarcated and unenhanced by contrast medium.
　Angiogram showed a relatively hypovascular mass with slight hypervascularity in the right hepatic arterial branches.
　Autopsy revealed a large retroperitoneal neurogenic sarcoma.
　Ultrasonography was effective in estimating tumor growth and monitoring response to chemotherapy.