患者男，２０岁。发现右中、下腹肿物２个月而来院。查体：一般情况好，右中、下腹可触及一肿物，边界不清，深在而固定。超声检查：右侧腹部可见一巨大肿物，上界紧贴肝脏下缘，下至盆腔右侧，外侧与右侧腹壁相贴，右侧髂血管受压前移，腹主动脉左移，此肿物内回声不均匀... Male patient, 20 years old. The right middle and lower abdominal masses were found in the hospital for 2 months. Physical examination: In general, the right middle and lower abdomen can touch a mass, the boundary is unclear, deep and fixed. Ultrasonography: A large mass is seen on the right abdomen. The upper border is close to the lower edge of the liver, down to the right side of the pelvis, and the lateral side is affixed to the right abdominal wall. The right iliac vessels are moved forward by pressure and the abdominal aorta is left. Inhomogeneous echo within the mass...