الفهرس 
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Abstract
Hypertrophied inferior nasal turbinates are the second most common cause of chronic nasal obstruction. The inferior turbinates have important role in maintenance of nasal breathing function. Hypertrophy of the inferior turbinate can be due to mucosal hyperplasia, protrusion of the bone part or by combination of both factors.
Our descriptive comparative study was carried on 30 patients with nasal obstruction due to hypertrophied inferior nasal turbinate. These patients divided into two groups group A for DNS with compensatory HIT and group B for HIT due to allergic rhinitis. Both groups underwent to partial inferior turbinectomy with or without septoplasty. Then Histopathological examination of the inferior turbinate specimens was done.
Results of micrometric analysis showed significant hypertrophy of bony layer of inferior turbinate in cases of compensatory hypertrophy when compared to allergic rhinitis cases. There was also significant hypertrophy of medial mucosal layer in cases of allergic rhinitis when compared to compensatory hypertrophy cases.
With these results we conclude that bone should be the target of surgery in treatment of hypertrophied inferior turbinate secondary to deviated nasal septum where submucous resection of bone or turbinoplasty is adequate to relieve the symptoms of nasal obstruction. Whereas in cases of allergic rhinitis with hypertrophied inferior turbinate where only medial mucosal layer is hypertrophied, limited resection of the mucosa either by diathermy or by other conservative methods is enough.