25 y/o male with incidental finding on MRI.
A round mass is seen in the midline of the posterior nasopharynx that is of low signal intensity on T1-weighted images and high signal intensity on T2-weighted images.
The Thornwaldt cysts represents residual notocordal tissue in the posterior nasopharynx. Respiratory epithelium may ingrow with development of a cystic fluid collection. The peak incidence is in the ages between 15 and 30 years.
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Last modified April 27, 1995
Copyright 1995 Ray Ballinger, University of Florida and VA Medical Center, Gainesville, FL.