患儿女,4岁。出生时即发现骶尾部肿物,约鸡蛋大小,质软,表面无红肿、无触痛、无渗出。该肿物进行性增大,来我院就诊。查体:患儿骶尾部后方可触及一大小约13cm×8cm×4cm肿物(图1),质软,无触痛,皮温不高,无破损及渗液,其内可触及骨性组织,初步诊断:局部肿物。超声所见:于骶尾部探及范围约10.2cm×7.8cm的软组织回声,内回声不均,形态不规则,有多个突起,较长突起内探 Children with children, 4 years old. Found sacrococcygeal mass at birth, about the size of eggs, soft, no swelling on the surface, no tenderness, no exudation. Progressive increase of the tumor, to our hospital. Physical examination: children after the sacrococcygeal reach a size of about 13cm × 8cm × 4cm tumor (Figure 1), soft, no tenderness, skin temperature is not high, no damage and exudate, which can reach the bony tissue Preliminary diagnosis: local mass. Ultrasound findings: In the sacrococcygeal exploration and the scope of about 10.2cm × 7.8cm soft tissue echo, echo uneven, irregular shape, a number of protuberances, longer protuberance exploration