Chondroma arising from the spinal dura mater at the thoracic level: A case report with molecular analysis.

Chondromas are benign tumors that can be found at several sites in the body, while those arising from the dura mater are extremely rare. Among them, although chondromas arising from the cranial dura mater have been reported, those arising from the spinal dura mater have not been reported in the literature to date. A 66-year-old woman presented with right-sided continuous backache which she had developed recently. After detailed examinations, an epidural tumor at the thoracic level was detected. The patient underwent surgery and a total en-bloc resection was accomplished. From the clinical and pathological findings, the tumor was revealed as chondroma arising from the spinal dura mater. A recent comprehensive study has identified the isocitrate dehydrogenase 1 (IDH1) and IDH2 mutations in conventional central and periosteal cartilaginous tumors, and it has subsequently been analyzed in intracranial chondrosarcoma and chondroma, including chondroma of the convexity dura mater. Herein, we describe a novel case of chondroma arising from the spinal dura mater, with mutation analysis of IDH1 and IDH2 both of which revealed wild-type.