Giant thymolipoma of mediastinum and neck - initially misdiagnosed as liposarcoma by core needle biopsy.

Thymolipomas are rare benign tumors, constituting one of the differential diagnoses of an anterior mediastinal mass. These tumors may have an indolent, asymptomatic course, often achieving massive dimensions before presentation. When it is symptomatic, respiratory symptoms predominate. We report a case of thymolipoma in a 30-year-old male complaining of heaviness and constricting type of chest pain and neck swelling of 1-year duration. Computed tomography scan finding revealed a space-occupying lesion in the anterior mediastinum and extend to the right side of the mediastinum, neck, and left hemithorax. A sono-guided core needle biopsy was carried out which identified an atypical cell and was suspicious to liposarcoma. The tumor was completely excised through "posterolateral thoracotomy." Postoperative histopathological examination confirmed the diagnosis of thymolipoma. This is the second case we have reported from our institution.