Fig. 20

Fifty-year-old woman with a 1-year history of dyspnoea on exertion. Axial a contrast and b non-contrast CT images demonstrating a large, eccentric soft tissue mass within the trachea. Image b demonstrates a large mass with obliteration of the fat plane with the oesophagus. c 3D VR image shows significant focal narrowing by the posterior mass with endoluminal extension. d Pathology reveals cribriform and microcystic growth patterns of bland basaloid cells with scant cytoplasm and angulated, hyperchromatic nuclei compatible with adenoid cystic carcinoma