A case of a rare odontogenic cyst arising in the lateral periodontal m
embrane in the mandible in a 14 year old girl is reported. This lesion
appeared to be a new entity and has been named glandular odontogenic
cyst (GOC) or sialo-odontogenic cyst. Histologically the lesion was li
ned by mucous producing cuboidal epithelium containing several areas o
f thickening and numerous duct-like structures. The cyst recurred with
the same histology two years postoperatively.