英语语法分析

Primary tumor in the sacrococcygeal region is unusual.

原发性骶骨部肿瘤较少见。

Pilonidal sinus is a common chronic disease of the sacrococcygeal region.

藏毛窦是一种骶尾部区常见的的慢性疾病。

An extensive sacrococcygeal chordoma is considered a challenge for neurosurgeons.

广泛性骶尾椎脊索瘤被认为是神经外科的挑战。