A cystic lesion at the apex of tooth no. 10 was described microscopically as an inflamed fibrous sac lined by nonkeratinized stratified squamous epithelium. The tooth was nonvital. This is a(n):

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This description matches a periapical cyst, also known as a radicular cyst, which is the most common type of cyst associated with the teeth. It occurs at the apex of a nonvital tooth and is characterized by an inflamed fibrous sac lined by nonkeratinized stratified squamous epithelium.

A Cystic Lesion at the Apex of Tooth No