has part has part characteristic of inheres in has modifier Glossoptosis SNOMEDCT_US:3639002 Lingual retraction UMLS:C0267048 HP:0000162 UMLS:C4280678 Presumably, use of the suffix ptosis refers to the situation where the patient is supine, and the displacement is downward. Strictly speaking, the term glossoptosis indicates falling of the tongue and thus can also be forward displacement; however by convention it is only used for backward displacement. Glossoptosis may cause obstruction of the airway. Posterior displacement of the tongue into the pharynx, i.e., a tongue that is mislocalised posteriorly. Retraction of the tongue Posterior displacement of the tongue Abnormal tongue morphology abnormal mislocalised posteriorly tongue