Abstract
Comparisons of paranasal sinus morphology between humans with and without cleft lip and palate (CLP) have yielded conflicting opinions regarding size differences. Although postnatal samples have been investigated, no studies have compared paranasal sinus volumes between cleft and noncleft human fetuses. The nasal cavities of 20 'normal' and 9 CLP human fetuses (8-21 weeks' postmenstrual age) were examined to assess prenatal volumetric changes of the maxillary sinuses, anterior and posterior ethmoidal air cells, and sphenoidal sinuses. Lengths and volumes of right and left maxillary and sphenoidal sinuses were calculated from histologically prepared sections using a computer reconstruction technique, and regression equations were generated to assess the enlargement rates. All paranasal sinuses were found among both normal and CLP specimens in the same locations and in similar age ranges. However, greater shape asymmetry was noted for all sinuses in CLP compared to normal specimens. In the normal sample, results indicated significant (p < .05) correlations between right or left maxillary sinus length (R2 = 0.49, 0.54) and volume (R2 = 0.67, 0.68), and increasing postmenstrual age, but no significant (p > .05) correlations were ob...Continue Reading
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