Atypical spindle cell lipomatous tumor in the pelvis causing sciatic nerve compression: A case report.

A 60-year-old woman with chronic lower back pain and deep gluteal pain with radicular symptoms was diagnosed with an atypical spindle cell lipomatous tumor in the pelvis compressing the sacral plexus and sciatic nerve. She underwent successful surgical excision of the tumor, resulting in significant symptom relief. This case highlights the importance of considering rare tumors in the pelvis, such as atypical spindle cell lipomatous tumors, in the differential diagnosis of radicular pain to avoid misdiagnosis.