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Helical computed tomography scanning of the larynx and upper trachea in rabbits.

Ajlan AM, Al-Khatib T, Al-Sheikah M, Jastaniah S, Salih A, Althubaiti A, Aljohani A, Marzouki H, Alherabi A, Marglani O, Rabah S, Karrouf G - Acta Vet. Scand. (2015)

Bottom Line: We also addressed the presence or absence of pre-epiglottic and paraglottic fat.The remaining airway components were otherwise either uncalcified or partially calcified.Such results may be used in further evaluation of the normal airway and in cases of subglottic stenosis.

View Article: PubMed Central - PubMed

Affiliation: Radiology Department, King Abdulaziz University Hospital, King Abdulaziz University, Jeddah, Western Region, Saudi Arabia. amrajlan@yahoo.com.

ABSTRACT

Background: Computed tomography (CT) is used to evaluate the human tracheobronchial tree because of its unsurpassed ability to visualize the airway and surrounding structures. To establish an ideal animal model for studying subglottic stenosis, we assessed the size and morphology of the normal rabbit's laryngotracheal airway by helical CT. We measured luminal dimensions at the levels of the arytenoid and cricoid cartilages and the first, third, and eighth tracheal rings. At all levels, the axial slices were used to calculate the maximum anteroposterior (AP) dimension, transverse dimension, and cross-sectional areas. We measured the tracheal length from the cricoid to the third and eighth tracheal rings on sagittal reformation. We assessed the hyoid, thyroid, cricoid, arytenoid, and tracheal rings for the presence of calcific or soft tissue densities. We also addressed the presence or absence of pre-epiglottic and paraglottic fat.

Results: The mean AP tracheal dimension ± standard deviation (SD) was 8.6 ± 0.5 mm at the arytenoid level, 8.2 ± 0.7 mm at the cricoid level, and 7.7 ± 0.2 mm at the first tracheal ring level. The transverse tracheal dimension ±SD was 5.3 ± 0.1 mm at the arytenoid level, 5.5 ± 0.5 mm at the cricoid level, and 6.1 ± 0.6 mm at the first tracheal ring level. The mean tracheal area ±SD was 35.7 ± 2.2 mm(2) at the arytenoid level, 35.8 ± 5.1 mm(2) at the cricoid level, and 39.2 ± 4.3 mm(2) at the first tracheal ring level. The tracheal length ±SD was 10.7 ± 2.3 mm from the cricoid to the third tracheal ring and 19.1 ± 1.14 mm to the eighth tracheal ring. There was complete calcification of the hyoid in all rabbits. Only two rabbits showed complete thyroid, arytenoid, or tracheal ring calcification. The remaining airway components were otherwise either uncalcified or partially calcified. The uvula, epiglottis, aryepiglottic fold, vallecula, piriform sinus, true/false vocal cords, and pre-epiglottic/paraglottic fat were not seen in any rabbit.

Conclusions: Helical CT investigation provides good, highly definitive anatomic details of the larynx and trachea in rabbits. Such results may be used in further evaluation of the normal airway and in cases of subglottic stenosis.

No MeSH data available.


Related in: MedlinePlus

Sagittal CT image showing a distance of 8.1 mm from the cricoid cartilage to the third tracheal ring
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Fig2: Sagittal CT image showing a distance of 8.1 mm from the cricoid cartilage to the third tracheal ring

Mentions: The tracheal lumen measurements are summarized in Table 1, and examples are presented in Figs. 1 and 2. The mean AP luminal tracheal dimension ±SD was 8.6 ± 0.5 mm at the arytenoid level, 8.2 ± 0.7 mm at the cricoid level, 7.7 ± 0.2 mm at the first tracheal ring level, 6.9 ± 0.3 mm at the third tracheal ring level, and 6.8 ± 0.3 mm at the eighth tracheal ring level. The mean luminal transverse tracheal dimension ±SD was 5.3 ± 0.1 mm at the arytenoid level, 5.5 ± 0.5 mm at the cricoid level, 6.1 ± 0.6 mm at the first tracheal ring level, 6.6 ± 0.2 mm at the third tracheal ring level, and 7.3 ± 0.1 mm at the eighth tracheal ring level. The mean luminal tracheal area ±SD was 35.7 ± 2.2 mm2 at the arytenoid level, 35.8 ± 5.1 mm2 at the cricoid level, 39.2 ± 4.3 mm2 at the first tracheal ring level, 36.5 ± 2.1 mm2 at the third tracheal ring level, and 4.2 ± 3.3 mm2 at the eighth tracheal ring level. The tracheal length ± SD was 10.7 ± 2.3 mm from the cricoid to the third tracheal ring and 19.1 ± 1.14 mm from the cricoid to the eighth tracheal ring.Table 1


Helical computed tomography scanning of the larynx and upper trachea in rabbits.

Ajlan AM, Al-Khatib T, Al-Sheikah M, Jastaniah S, Salih A, Althubaiti A, Aljohani A, Marzouki H, Alherabi A, Marglani O, Rabah S, Karrouf G - Acta Vet. Scand. (2015)

Sagittal CT image showing a distance of 8.1 mm from the cricoid cartilage to the third tracheal ring
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4590308&req=5

Fig2: Sagittal CT image showing a distance of 8.1 mm from the cricoid cartilage to the third tracheal ring
Mentions: The tracheal lumen measurements are summarized in Table 1, and examples are presented in Figs. 1 and 2. The mean AP luminal tracheal dimension ±SD was 8.6 ± 0.5 mm at the arytenoid level, 8.2 ± 0.7 mm at the cricoid level, 7.7 ± 0.2 mm at the first tracheal ring level, 6.9 ± 0.3 mm at the third tracheal ring level, and 6.8 ± 0.3 mm at the eighth tracheal ring level. The mean luminal transverse tracheal dimension ±SD was 5.3 ± 0.1 mm at the arytenoid level, 5.5 ± 0.5 mm at the cricoid level, 6.1 ± 0.6 mm at the first tracheal ring level, 6.6 ± 0.2 mm at the third tracheal ring level, and 7.3 ± 0.1 mm at the eighth tracheal ring level. The mean luminal tracheal area ±SD was 35.7 ± 2.2 mm2 at the arytenoid level, 35.8 ± 5.1 mm2 at the cricoid level, 39.2 ± 4.3 mm2 at the first tracheal ring level, 36.5 ± 2.1 mm2 at the third tracheal ring level, and 4.2 ± 3.3 mm2 at the eighth tracheal ring level. The tracheal length ± SD was 10.7 ± 2.3 mm from the cricoid to the third tracheal ring and 19.1 ± 1.14 mm from the cricoid to the eighth tracheal ring.Table 1

Bottom Line: We also addressed the presence or absence of pre-epiglottic and paraglottic fat.The remaining airway components were otherwise either uncalcified or partially calcified.Such results may be used in further evaluation of the normal airway and in cases of subglottic stenosis.

View Article: PubMed Central - PubMed

Affiliation: Radiology Department, King Abdulaziz University Hospital, King Abdulaziz University, Jeddah, Western Region, Saudi Arabia. amrajlan@yahoo.com.

ABSTRACT

Background: Computed tomography (CT) is used to evaluate the human tracheobronchial tree because of its unsurpassed ability to visualize the airway and surrounding structures. To establish an ideal animal model for studying subglottic stenosis, we assessed the size and morphology of the normal rabbit's laryngotracheal airway by helical CT. We measured luminal dimensions at the levels of the arytenoid and cricoid cartilages and the first, third, and eighth tracheal rings. At all levels, the axial slices were used to calculate the maximum anteroposterior (AP) dimension, transverse dimension, and cross-sectional areas. We measured the tracheal length from the cricoid to the third and eighth tracheal rings on sagittal reformation. We assessed the hyoid, thyroid, cricoid, arytenoid, and tracheal rings for the presence of calcific or soft tissue densities. We also addressed the presence or absence of pre-epiglottic and paraglottic fat.

Results: The mean AP tracheal dimension ± standard deviation (SD) was 8.6 ± 0.5 mm at the arytenoid level, 8.2 ± 0.7 mm at the cricoid level, and 7.7 ± 0.2 mm at the first tracheal ring level. The transverse tracheal dimension ±SD was 5.3 ± 0.1 mm at the arytenoid level, 5.5 ± 0.5 mm at the cricoid level, and 6.1 ± 0.6 mm at the first tracheal ring level. The mean tracheal area ±SD was 35.7 ± 2.2 mm(2) at the arytenoid level, 35.8 ± 5.1 mm(2) at the cricoid level, and 39.2 ± 4.3 mm(2) at the first tracheal ring level. The tracheal length ±SD was 10.7 ± 2.3 mm from the cricoid to the third tracheal ring and 19.1 ± 1.14 mm to the eighth tracheal ring. There was complete calcification of the hyoid in all rabbits. Only two rabbits showed complete thyroid, arytenoid, or tracheal ring calcification. The remaining airway components were otherwise either uncalcified or partially calcified. The uvula, epiglottis, aryepiglottic fold, vallecula, piriform sinus, true/false vocal cords, and pre-epiglottic/paraglottic fat were not seen in any rabbit.

Conclusions: Helical CT investigation provides good, highly definitive anatomic details of the larynx and trachea in rabbits. Such results may be used in further evaluation of the normal airway and in cases of subglottic stenosis.

No MeSH data available.


Related in: MedlinePlus