Sciatic endometriosis diagnosed by computerized tomography-guided biopsy and CD10 immunohistochemical staining.

Objective: To report a case of sciatic endometriosis diagnosed by computerized tomography (CT)-guided biopsy in combination with CD10 immunohistochemical staining.

Methods: Case report. Methods: University hospital. Methods: A 33-year-old Japanese woman complaining of right-sided sciatica. Methods: Transgluteal computerized tomography (CT)-guided needle biopsy of a mass in the course of the right sciatic nerve was conducted for a histologic diagnosis. Methods: Histologic study with hematoxylin and eosin staining and CD10 immunohistochemical staining was performed.

Results: Computerized tomography-guided biopsy was performed without any complication. CD10 staining distinguished endometrial stromal cells.

Conclusions: Computerized tomography-guided biopsy followed by CD10 immunohistochemical staining is a minimally invasive procedure for accurate diagnosis of sciatic endometriosis.