Extensive solitary fibrous tumor centered on the temporal bone: A case report

Abstract

Background: Solitary fibrosis tumor (SFT) is rarely encountered in the field of otolaryngology and head and neck regions. Moreover, there are very few reports of tumors in the temporal bone. This report presents an extensive SFT case located not only on the temporal bone but also on the parapharyngeal space, Eustachian tube, and Internal auditory canal (IAC). The diagnosis, clinical course, and treatment approaches are discussed. Case: A 73-year-old man was followed up in the long-term for an external ear canal tumor. Due to the growing shadow on the MRI image and aggravation of clinical symptoms such as ear pain, we performed surgery to reduce the volume and prevent intracranial complications. Although a large part of the tumor in the temporal bone was removed, the tumor around deep parts such as the Eustachian tube could not be removed. Hence, adjuvant radiotherapy (RT) (60Gy/30Fr) was performed, and the residual tumor disappeared. The clinical symptoms improved as well, and the tumor did not show re-expansion for three years after the surgery. Discussion: In general, SFTs are often benign, but those that occur around the skull base are often histologically malignant and it is clinically not easy to perform a total resection. It was essential to consider some factors, such as the intervention timing and surgical range.

Keywords

• Solitary fibrosis tumor
• Hemangiopericytoma
• Skull base tumor
• Temporal bone
• Radiotherapy