Tornwaldt's (Thornwaldt's) or nasopharyngeal cyst is an uncommon developmental
benign cyst located in the midline postero-superior wall of nasopharynx. Incidence reported in
general population is 0.06%. It occurred in the potential space due to outpouching of ectoderm into
the pharyngobasilar fascia at the site where notochord attached to pharyngeal ectoderm. (Copied from article).