An ancient schwannoma misdiagnosed as a dermoid cyst on ultrasound examination: a case report

Ancient schwannomas are benign long-standing schwannomas of the neural sheaths. This schwannoma subtype is characterized by cystic and hemorrhagic changes. These degenerative changes are thought to result from the tumor’s long-term progression and have the potential to be misdiagnosed as other soft tissue tumors or sarcomas. A thorough examination, including magnetic resonance imaging, is necessary to identify these tumors, preventing potential misdiagnosis and treatment.