Asamoah D K
Clin Radiol. 1979 Sep;30(5):485-8. doi: 10.1016/s0009-9260(79)80176-2.
Normal filling defects in the barium-filled oropharynx are described. These pseudotumours result from the contraction, elevation and backward pulling of the soft palate assisted by the rounded ridge (of Passavant) in the pharyngeal wall produced by contraction of the palatopharyngeal sphincter, and the action of the palatopharyngei during swallowing. Other anatomical explanations for these filling defects are mentioned. The importance of recognising the changing pattern of these defects as being normal, and their differentiation from space occupying lesions in the oropharynx is emphasised.
描述了钡剂充盈的口咽正常充盈缺损。这些假瘤是由腭咽括约肌收缩产生的咽壁圆形嵴（帕萨万特嵴）辅助软腭收缩、抬高和向后牵拉，以及吞咽时腭咽肌的作用所致。文中提及了这些充盈缺损的其他解剖学解释。强调了认识到这些缺损形态变化为正常情况的重要性，以及它们与口咽占位性病变的鉴别。
