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earlier , the cyst was referred by many names , e.g. , nasoalveolar cyst , nasal vestibule cyst , nasal wing cyst , and mucoid cyst of the nose .
rao revised the nomenclature and defined nasolabial cysts as lesions located entirely within soft tissue , different from nasoalveolar cysts , which cause maxillary bone erosion .
previous reports suggest an adult onset , higher incidence among women and preponderance on left side .
it usually presents as an asymptomatic swelling beneath the ala of nose . in the previous reports and literature ,
it was mentioned that nasolabial cyst clinical features of an asymptomatic swelling beneath the ala of nose and characteristic lip swelling are diagnostic . however
, this case report describes a 36-year - old male , who reported to our department with the chief complaint of swelling lateral to right ala of nose since 4 months .
a 36-year - old male patient , reported to our department with the chief complaint of swelling lateral to right ala of nose since 4 months .
there was mild pain and associated white watery discharge intraorally from the swelling on pressure application .
extra oral examination revealed an ovoid swelling measuring 4  3 cm , lateral to right ala of nose [ figure 1 ] .
swelling was soft , fluctuant , movable with diffuse margins with slight local rise in temperature .
intraorally , the swelling was soft , extending from canine to first molar and overlying mucosa was normal .
radiographic investigations included opg [ figure 2 ] and water 's view [ figure 3 ] which revealed no significant findings . on aspiration ,
diagnosis included canine space infections , salivary gland cyst and tumors , lipoma , epidermoid inclusion cysts and sebaceous cysts . microscopic examination [ figure 4 ] revealed epithelial lining of varied thickness showing cuboidal to polyhedral cells arranged in a stratified manner .
nasolabial cysts represent about 0.7% of all cysts in the maxillofacial region , and 2.5% of non odontogenic cysts .
many authors believe that its prevalence is actually higher than presented in the literature ; however , due to misdiagnosis , indexes remain low .
nasolabial cysts are usually unilateral , but bilateral cases have been also reported . swelling in this case was also unilateral .
there is a sex predilection of incidence in females ( 3.7:1 ) and age predilection in 2 to 7 decade though it frequently occurs during middle age .
some authors suggest that lesion arises from misplaced epithelium of nasolacrimal rod or duct remnants and others suggest that it is a fissural cyst arising from epithelial remnants entrapped in the developmental fissures between the lateral nasal , globular , and maxillary processes . because of the location of the cyst in this case , the second theory seems to be more acceptable .
extraorally , patients usually complain of a swelling adjacent to the nose , and sometimes the cyst may be observed on routine examination .
intraorally , swelling is usually present in the maxillary labial sulcus but may reach great dimensions and extend to the buccal sulcus , causing discomfort with the use of dentures , breathing obstruction and facial asymmetry . swelling in this case
cyst lies in soft tissues with usually no radiographic findings , but it can sometimes cause erosion of the underlying maxillary bone which may be observed in radiographic examination . because nasolabial cyst is a soft - tissue mass ,
histologically , the cyst may be lined by pseudostratified columnar epithelium which is sometimes ciliated often with goblet cells and mucous cells , or by stratified squamous epithelium .
the lining in this case was also stratified squamous with goblet cells and mucous cells .
treatment of choice is enucleation which has low recurrence rate . the cyst in this case was also enucleated with no recurrence .
this case is unique in that respect as none of the earlier case report has mentioned a similar location of the entity .
the unusual location in this case imply that nasolabial cyst may manifest in a location different from its common position beneath the ala of nasi or some unrecognized entity exists in a lateral location with features similar to nasolabial cyst .
the nasolabial cyst is a rare nonodontogenic cyst originating in maxillofacial soft tissues . in the previous reports and literature 
 , it is mentioned that nasolabial cyst clinical features of an asymptomatic swelling beneath the ala of nose and characteristic lip swelling are diagnostic . 
 this is a case report of a 36-year - old male , who reported to our department with the chief complaint of swelling lateral to right ala of nose since 4 months . 
 characteristic lip swelling was missing . 
 the reason for this unusual finding is not documented in the literature .