The Diagnosis and Treatment of Solitary Fibrous Tumor of the Parotid Gland.

Abstract

Solitary fibrous tumor is relatively rare, and solitary fibrous tumor of the parotid gland is even less common. The clinical features of solitary fibrous tumor are non-specific, making early diagnosis difficult. The diagnosis mainly depends on pathological histology and immunohistochemistry. The solitary fibrous tumor is considered as a borderline tumor. Most tumors are benign, while malignant transformation is less common. Currently, surgical treatment is the main approach, and radiotherapy may be used for malignant patients after surgery. This study presents 2 cases of solitary fibrous tumor arising in the parotid gland. Case 1 is a 49-year-old woman who presented with right cervical mass. Imaging studies demonstrated a well-defined mass in the deep lobe of the parotid gland extending into the right parapharyngeal space. The patient underwent right total parotidectomy and had manifestations of facial paralysis after surgery, but recovered about 5 months later. Case 2 is a 16-year-old female who presented with left cervical mass. Imaging studies showed a round mass in the superficial lobe of the parotid gland with significant enhancement. The patient underwent left superficial parotidectomy and recovered well without any manifest facial nerve palsy. The accurate diagnosis of benign solitary fibrous tumors was obtained by the immunohistochemistry. These 2 patients were regularly followed up after the operation, and no obvious recurrence changes were observed.