患者男,31岁,工人.骶尾部肿块渐大31年,于1987年12月28日入院.患者生后骶尾部即有一鸡蛋大小肿块,生长缓慢,近一年来增大明显,无疼痛等不适,不影响排便及活动.查体:骶尾部有一约30×30×15cm囊性多房性肿块,为不规则形,边界清,活动度差,无压痛,肛门位肿块最下方(相当胸膝位 The patient male, 31 years old, had an enlarged mass in the sacrococcygeal tail for 31 years. He was admitted to the hospital on December 28, 1987. The patient had an egg size lump in the sacrococcygeal gland after the birth. The growth was slow, and it increased significantly in the past year. No pain or discomfort occurred. , Does not affect defecation and activities. Physical examination: The sacrococcygeal area has a cystic multilocular mass of approximately 30 x 30 x 15 cm. It is irregularly shaped with clear borders, poor mobility, and no tenderness. The anal position is the bottom of the mass. Bit