Transverse sectional imaging anatomy and clinical significance of the parapharyngeal space

Objective To provide sectional anatomic data for radiology and clinical diagnosis of the parapharyngeal space diseases. Methods 20 cadavers underwent CT examination and then transverse specimens were made in head and neck. At pharyngeal recess level, parapharyngeal space and parapharyngeal structures were observed and measured in the diameter and area with vernier caliper and planimeter. Results The shape of the parapharyngeal space was similar triangle at pharyngeal recess level, It was 447.6 ±2.18 mm2 (left) and 446.4 ±2.10 mm2 (right) on transverse section and CT in area of the parapharyngeal space respectively. Parapharyngeal space and parapharyngeal structures were symmetrical of both sides. Parapharyngeal space was divided into two parts by the line from the styloid process to pharyngeal recess : preparapharyngeal and retroparapharyngeal space. It was better to show relationship of structures in the retroparapharyngeal space with CT. Conclusion Fatty tissue, internal carotid artery, internal jugular vein, styloid process and medial pterygoid muscle were important anatomical marks for CT diagnosis. Transverse sectional anatomy of the parapharyngeal space has important significance for imaging diagnosis of diseases.