鼻咽旁间隙是肿瘤（如鼻咽癌）易侵犯的区域。临床检查该区域相当困难。为此，准确评估肿瘤侵犯有赖于横断层图象。CT诊断鼻咽癌的咽旁侵犯及分期，主要依赖于鼻咽腔的形态对称性和筋膜脂肪层情况。分析了137例正常鼻咽部的CT扫描，表明有30q0的人咽旁间隙左右不对称，其平均宽 Nasopharyngeal space is an area where tumors (eg nasopharyngeal carcinoma) are vulnerable. It is difficult to clinically inspect the area. For this reason, accurate assessment of tumor invasion depends on cross-sectional images. CT diagnosis of nasopharyngeal parapharyngeal invasion and staging, mainly depends on the morphological symmetry of the nasopharyngeal cavity and fascial fat layer. Analysis of 137 cases of normal nasopharynx CT scans showed that there was 30q0 of human parapharyngeal space left and right asymmetry, the average width