Brain tumors are serious pathologies that can lead to significant morbidity and mortality, and early detection and diagnosis may result in favorable outcomes for patients. We present the case of a 27-year-old male who was referred to the Department of Behavioural Medicine of the Sultan Qaboos University Hospital (SQUH), Muscat, Oman, in 2019, due to worsening of his depressive symptoms. Depression was the only initial symptom of the patient's solitary fibrous tumor, and surgical resection of the tumor followed by radiotherapy resulted in the complete remission of his psychiatric symptoms.