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Case 100012

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Disease / syndrome / tumor / condition

Region of interest

Q4

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Canaray 100012

1. Marsupialized unilocular cystic lesion in pericoronal region of tooth 45

A well defined unilocular radiolucent cystic lesion is present in the pericoronal region of site 45, and is preventing the eruption of this partially developed tooth. This entity has displaced the partially developed tooth 44 medially, and has caused buccolingual expansion of the alveolar process. No damage has occurred to the developing roots of tooth 46. The inferior alveolar nerve canal has been inferiorly displaced adjacent to the region, but its cortical periphery remains intact. The lesion has perforated through the crest of the alveolar process, likely due to the history of biopsy. Low-density granular bone is present at the inferior periphery of the entity, which is consistent with a marsupialized cystic lesion. The histopathologic report indicates that the lesion is a unicystic ameloblastoma.

Axial views of mid-fourth quadrant

These axial cross sectional images demonstrate the buccolingual expansion of the alveolar process at site 45, as well as the low-density granular bone that is present at the inferior periphery of the cystic lesion, which is consistent with recent marsupialization.

Mesiodistal views of tooth 45

These mesiodistal cross sectional images demonstrate the mesial displacement of the unerupted tooth 44, and the inferior displacement of the partially developed tooth 45, and the marsupialization of the cystic lesion through the alveolar crest at site 45.

Buccolingual views of site 45

These buccolingual cross sectional images demonstrate the low-density granular bone is present at the inferior periphery of the marsupialized cystic lesion, as well as the inferiorly displaced inferior alveolar nerve canal at the inferior cortical plate.

2. Secondarily affected tooth 46

The lamina dura has been lost on the mesial surface of the mesial root of tooth 46. The tooth appears normal otherwise.