Residual Cyst — MFDS Part 1 MCQ
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Correct answer: D — A radicular cyst that persists after the causative tooth has been extracted
A residual cyst is a radicular cyst that remains within the jaw after extraction of the tooth responsible for the original pulpal and periapical inflammation. It is therefore an inflammatory odontogenic cyst found at the site of a previously extracted tooth. A dentigerous cyst is associated with the crown of an unerupted tooth, while an odontogenic keratocyst is a separate developmental odontogenic cyst rather than a recurrent residual cyst. Nasopalatine duct cysts are non-odontogenic developmental cysts of the incisive canal. Lateral periodontal cysts usually arise beside the root of a vital tooth and do not become residual cysts simply because a tooth is subsequently lost.
Reference: Titinchi F, Morkel J. Residual cyst of the jaws: A clinico-pathologic study of this seemingly inconspicuous lesion. PLoS One. 2020;15(12):e0244250. https://pubmed.ncbi.nlm.nih.gov/33332452/