Costochondral Exostoses Mimicking as a Posterior Mediastinal Mass: A Case Report - Abstract
Exostosis (Osteochondroma) is a rare tumor in the rib, but in the mediastinum it is extremely rare. Herein, we report a case of 32-year old male patient with a symptomatic solitary costal exostosis in the left hemi thorax mimicking a mediastinal mass. The chest X-ray and magnetic resonance imaging (MRI) of the chest revealed a bone density structure that had originated from the costochondral junction of the left 10th and 11th ribs and protruded into the thoracic cavity. Exploratory thoracotomy showed that the exostosis had scratched the adjacent aorta, diaphragm and spinal column in the paravertebral sulcus. An 8 × 6 cm mass with long rib segment including the exostosis was excised. Surgical resection is indicated for definitive diagnosis and prevention of complications and malignancy. Surgical excision and histopathology confirmed the diagnosis of exostosis (osteochondroma).