Solitary fibrous tumor is a rare type of tumor that originates from the mesenchymal cells. It can range from a slow-growing tumor to a more aggressive mass. This type of tumor usually occurs in people between the ages of 60 to 70. In approximately 80% of cases, it develops from the visceral pleura, and around 30% of solitary fibrous tumors that arise from the pleura are malignant ^1,2.

The main differential diagnoses include localized mesothelioma, solitary pleural metastasis, pleural lymphoma, peripheral lung cancer, and intercostal nerve neurilemoma (schwannoma).