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Recurrent otitis media and persistent otitis media with effusion in early childhood may cause an atelectatic eardrum and adhesive otitis media, which sometimes progress to pars tensa cholesteatoma. When and how children with adhesive otitis media should be operated on remain controversial. Therefore, this study aimed to analyze the clinical characteristics of children with adhesive otitis media and pars tensa cholesteatoma, and to determine the risk factors of progression to cholesteatoma.Seventeen ears of 15 children with adhesive otitis media (adhesive group) and 14 ears of 13 children with pars tensa cholesteatoma (tensa cholesteatoma group) who underwent tympanoplasty were included in this study. We analyzed the following clinical characteristics of children in both groups: medical and life history, associated diseases, sites of the adhesion, and development and aeration of mastoid air cells as shown by temporal bone computed tomography.Most of the children in both groups had a history of recurrent otitis media and/or persistent otitis media with effusion. They showed a male predominance and a frequent association of allergic rhinitis. The number of ears showing undeveloped mastoid air cells in the tensa cholesteatoma group was significantly larger than that in the adhesive otitis media group (P=0.0068). A lack of aeration of the middle ear, including the eustachian tube, was more frequently found in ears with pars tensa cholesteatoma than in ears with adhesive otitis media (P=0.0012). Using multivariate logistic regression, the presence of otorrhea (odds ratio [OR], 14.847; 95% confidence interval [CI], 0.834-264.184), total adhesion (OR, 28.550; 95% CI, 0.962-847.508), and undeveloped mastoid air cells (OR, 19.357; 95% CI, 1.022-366.589) were related to pars tensa cholesteatoma.Children with adhesive otitis media should be carefully followed up in the outpatient setting. Ears with poor mastoid development may develop pars tensa cholesteatoma. Additionally, ears with middle ear effusion, total adhesion, and the presence of otorrhea tend to be at risk of pars tensa cholesteatoma. Tympanoplasty or tympanostomy tube insertion should be considered for children with adhesive otitis media who have these risk factors to prevent progression to pars tensa cholesteatoma.