Reason: ? mass compressing trachea History: see CXR, CT chest. Limited examination without contrast. LUNGS AND PLEURA: No significant abnormality noted.MEDIASTINUM AND HILA: Within the anterior mediastinum between the trachea and left common carotid and subclavian arteries, there is a lobulated collection that measures 3.6 x 3.1 x 4.6 cm (AP x TR x oblique CC; series 16 image 39, series 15 image 9), which demonstrates homogeneous T2 slightly hyperintense signal and T1 hyperintense signal compatible with proteinaceous material or blood products. Associated tracheal deviation and narrowing. There is possibly connection anterolaterally with the brachiocephalic artery (series 11 image 31). Thin hypointense rim correlates with thin peripheral calcification seen on CT. CHEST WALL: No significant abnormality noted.UPPER ABDOMEN: No significant abnormality noted.
Limited examination without intravenous contrast. 3.6 x 3.1 x 3.6 cm proteinaceous lobulated collection in the anterior mediastinum may represent a postsurgical collection such as seroma, hematoma, or lymphocele from prior parathyroid removal. Without contrast, a thrombosed aneurysm/pseudoaneurysm of the brachiocephalic artery cannot be excluded. 