关键词: 颅骨；胆脂瘤；体层摄影术，X线计算机

Abstract:

Objective   To investigate the CT characteristics of skull chlesteatoma， and explore its diagnostic accuracy. Methods   CT characteristics of 15 skull chlesteatomas confirmed by surgery and pathology were retrospectively analyzed. CT plain scan were performed in all the patients, while extra enhanced CT scan was done in 2 cases. Results   On the CT images, all cases were solitary. 14 cases originated from intradiploe， and one case  from skull suture. Extensive destruction of the skull with hard margin was found in 15 patients. 7 cases presented crater-form deossificatio. 11 cases demonstrated  inhomogeneous density in which 6 cases showed calcification. The fat-like density was noticed mainly in one case, the water-like density mainly in 2 cases, the iso-density mainly in 2 cases, and homogeneous density in 4 cases. MPR and VR images could display the shape and scope of destruction. 2 cases showed mild enhancement on contrast CT. Conclusion   CT scanning of skull chlesteatomas has some features, CT combining with post-processing techniques are very effective in the diagnosis of skull chlesteatomas．