A large mass located in the posterior mediastinum was incidentally detected on thoracic computed tomography in a 21-year-old female patient who presented after an in-vehicle traffic accident. The localization of the mass was confirmed by magnetic resonance imaging. The tumor was completely excised, and the sixth rib was partially resected. Histopathological examination established the final diagnosis of intraosseous hemangioma. The patient was discharged without postoperative complications and has remained recurrence-free during 3 years of follow-up.
Keywords: Costal hemangioma, posterior mediastinum, rare tumor.