Nasolabial cyst
-Nasolaial cyst is a rare develpmental cyst arises in the soft tissue of upper lip lateral to midline, just below the ala of nose.
Etiology & pathogenesis,
There are 2 theories: the first theory considered nasolabial cyst to arise from remnants of epithelium at the site of fusion of the maxillary, medial nasal & lateral nasal processes.It is now suggested that the second theory is the most propable theory which consider nasolabial cyst to arise from remnants of misplaced epithelium of nasolacrimal duct.
Clinically,
-Female to male ratio is 4:1 .
-Nasolabial cyst appears as a swelling over canina region in the mucobuccal fold of the upper lip bellow ala of the nose .
-Because the cyst is asoft tissue cyst so there is not radiographic picture for this cyst.
Histopathological features,
Lining is pseudostratifies columnar epithelium ,mucous cells and cilia may be found,and inflammation may present if the cyst is secondary inflammed,
Treatment,
complete surgical excision.
N.B:
Nasolabial cyst is also known as nasoalveolar cyst ,klestadt cyst but because no bone is involved, its former name, nasoalveolar cyst, is inappropriate.
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