Limits...
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

Representative images of computed tomography measurements used in this study. a Transverse CT image showing the trachea with an anteroposterior diameter of 8.3 mm at the arytenoid cartilage level. b Transverse CT image showing the trachea with a transverse diameter of 5.3 mm at the arytenoid cartilage level. c Transverse CT image showing the trachea with an area of 34.6 mm2 at the arytenoid cartilage level
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig1: Representative images of computed tomography measurements used in this study. a Transverse CT image showing the trachea with an anteroposterior diameter of 8.3 mm at the arytenoid cartilage level. b Transverse CT image showing the trachea with a transverse diameter of 5.3 mm at the arytenoid cartilage level. c Transverse CT image showing the trachea with an area of 34.6 mm2 at the arytenoid cartilage level

Mentions: An experienced radiologist performed the tracheal measurements manually at the levels of the arytenoid, cricoid, first tracheal ring, third tracheal ring, and eighth tracheal ring. At all levels, the axial slices were used to calculate the maximum anteroposterior (AP) diameter, transverse diameter, and cross-sectional area (Fig. 1a–c). The cursors were placed on the inner walls of the trachea for all lumen measurements. The tracheal length from the cricoid to the third and eighth tracheal rings was measured on the sagittal reformation (Fig. 1d).Fig. 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)

Representative images of computed tomography measurements used in this study. a Transverse CT image showing the trachea with an anteroposterior diameter of 8.3 mm at the arytenoid cartilage level. b Transverse CT image showing the trachea with a transverse diameter of 5.3 mm at the arytenoid cartilage level. c Transverse CT image showing the trachea with an area of 34.6 mm2 at the arytenoid cartilage level
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig1: Representative images of computed tomography measurements used in this study. a Transverse CT image showing the trachea with an anteroposterior diameter of 8.3 mm at the arytenoid cartilage level. b Transverse CT image showing the trachea with a transverse diameter of 5.3 mm at the arytenoid cartilage level. c Transverse CT image showing the trachea with an area of 34.6 mm2 at the arytenoid cartilage level
Mentions: An experienced radiologist performed the tracheal measurements manually at the levels of the arytenoid, cricoid, first tracheal ring, third tracheal ring, and eighth tracheal ring. At all levels, the axial slices were used to calculate the maximum anteroposterior (AP) diameter, transverse diameter, and cross-sectional area (Fig. 1a–c). The cursors were placed on the inner walls of the trachea for all lumen measurements. The tracheal length from the cricoid to the third and eighth tracheal rings was measured on the sagittal reformation (Fig. 1d).Fig. 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