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Age and gender related changes in bronchial tree: a morphometric study with multidedector CT.

OBJECTIVE: The aims of this study are the identification of differences in the diameter, length, area and branching angles of the trachea and bronchi with gender and age, and the identification of trachea types by using MDCT images.

PATIENTS AND METHODS: The thoracic MDCT images of 253 patients (0-74 years old, 142 male and 111 female) were evaluated. Tracheal diameter, tracheal cross-sectional area, diameter and length of bronchi, and several angles of the bronchial tree [e.g. subcarinal angles (SCA), interbronchial angles (IBA)] were measured.

RESULTS: Average anteroposterior and transverse diameter of the trachea in adult patients were measured as 15.8 ± 2.9 mm and 17.5 ± 3.7 mm respectively. Average tracheal cross-sectional areas in adult patients were calculated as 160.7 ± 41.3 mm² in females and as 275.7 ± 57.3 mm² in males. Four types of trachea were identified as circular (68% in adults, 73% in children), oval (13%, 15%), rectangular (11%, 5%) and horseshoe shaped (8%, 7%). The average right and left SCA were calculated as 34.5º ± 8.1º and 38.1º ± 8.9º respectively. The average right and left IBA were calculated as 32.4º ± 7.7º and 35.2º ± 8.1º respectively.

CONCLUSIONS: The findings of this study may be helpful during bronchoscopy and tube and stent application procedures. MDCT seems to be a convenient technique for the evaluation of the bronchial tree.

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