Tawab HMA, et al. - In this prospective study, researchers identified a correlation between adenoid size, tympanometric findings, and type of fluid in the middle ear regardless of the duration of the disease. Participants in the study were 100 pediatric patients aged 12 years and less. Cases with tympanometry evidence of COME (B, Cs) and adenoid hypertrophy seen by nasal endoscopy have been involved. A high correlation was found between adenoid size and incidence of otitis media with effusion [defined as the presence of fluid in the middle ear with the absence of criteria of acute middle ear infections]. A highly significant relation was observed between grade Ⅳ adenoid hypertrophy and tympanometry type B, as well as there is a highly significant relation between adenoid hypertrophy grade Ⅳ and mucoid type of middle ear effusion. More viscosity of middle ear effusion was detected with more increase in the adenoid size.