A case of primary @entity6323 was reported. The @entity1 , a 74-year-old @entity1 , consulted our hospital with @entity615 and abdominal mass in right flank. Probe laparotomy revealed a @entity5 situated in the retroperitoneum and multiple metastatic nodules in the liver. Biopsy was performed and diagnosed as @entity1822 . He was intensively treated with antineoplastic chemotherapy, but his condition gradually aggravated. He died 4 months after admission. The autopsy revealed a right retroperitoneal mass (17 @entity69199 18 cm in size, 1,340 g in weight) that showed a yellowish appearance. There was also a thumb-tip sized @entity5 with a stalk in the lumen of inferior vena cava. Both @entity5 grew in continuity with each other through the wall of inferior vena cava. The @entity5 were diagnosed as @entity1822 , which derived from inferior vena cava.

[A case of XXXX ].

@entity1 :: ('9606', 'Species') :: ['patient', 'man'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'tumors'] @entity69199 :: ('p|SUB|X|12|X', 'ProteinMutation') :: ['X 12 X'] @entity615 :: ('MESH:D001416', 'Disease') :: ['complaints of back pain'] @entity1822 :: ('MESH:D007890', 'Disease') :: ['leiomyosarcoma'] @entity6323 :: ('MESH:C563013', 'Disease') :: ['leiomyosarcoma of the inferior vena cava']
@entity6323 :: (MESH:C563013,Disease) :: ['leiomyosarcoma of the inferior vena cava']
