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| Clinical values of CT scan with oral contrast agent for displaying the anatomical structure in hypopharynx |
| Tianjin Hospital, Tianjin 300210, China |
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Abstract Objective: To investigate the clinical value of spiral CT scan with oral contrast agent for displaying the anatomical structure of postcricoarytenoid region and piriform sinus region. Methods: The CT images of 60 patients after conventional spiral CT scan were reviewed and the CT images of 60 patients after spiral CT scan with oral contrast agent were analyzed. The anatomical structures of postcricoarytenoid region and piriform sinus region were observed. The demonstration rate was calculated and the image rating was evaluated by two radiologists and two otolaryngology doctors with a double-blind method. Chi-square test was adopted in statistical analysis. Results: In conventional spiral CT scan, the air occurrence rates were 65% and 70% in the right and left sinuses respectively. The detection rate of hypopharyngeal cavity was 43.3% in the arytenoid cartilage level and was 28.3% in the cricoid cartilage level. After orally contrasted spiral CT scanning, the left and right piriform sinus occurrence rates were 91.7%(55/60) and 90%(54/60). The detection rates of hypopharyngeal cavity in the arytenoid and cricoid cartilage level were 93.3%(56/60) and 96.7%(58/60) respectively. P<0.05 was considered statistically different. Conclusion: CT scans with oral contrast agent can contour the profile of hypopharynx and clearly display the anatomical structure of the postcricoarytenoid region and piriform sinus region in closed state. It can cover the shortage of clinical laryngoscope and provide objective images for detecting early diseases and confirming the surgical staging.
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Received: 21 June 2015
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2016, Vol. 27 
