R. NICKBRYANMDPATRICIA A.HUDGINSMD
The incidence of Thornwaldt cyst is reported to be between 0.2% on magnetic resonance imaging,1 often detected as an incidental finding, and 4% of normal autopsy specimens.2 The peak age at onset is 15 to 30 years, with no reported sex predilection. Typically, the cyst is unilobular but may be multilobular and, if large, can extend from the midline.
Radiology Quiz Case—Diagnosis. Arch Otolaryngol Head Neck Surg. 2003;129(10):1138. doi:10.1001/archotol.129.10.1137-a