Extrapleural solitary fibrous tumor in thymic area

RATIONALE: Solitary fibrous tumor (SFT) is a rare benign soft tissue mesenchymal neoplasm. There have been a few reports of extrapleural SFTs although it can occur anywhere in the body. PATIENT CONCERNS: A 30-year-old male presented with an anterior neck mass since one month. DIAGNOSES: Based on physical and radiologic examination, preliminary differential diagnosis was thymic neoplasm or intrathoracic goiter. INTERVENTIONS: We performed surgical excision of the neck mass. OUTCOMES: The histopathological examination revealed an extrapleural SFT LESSONS:: We present a case of extrapleural SFT in the thymus which was misdiagnosed as thymoma based on radiologic findings.