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Glossoptosis is a medical condition and abnormality which involves the downward displacement or retraction of the tongue.^[1] It may cause non-fusion of the hard palate, causing cleft palate.

It is one of the features of Pierre Robin sequence and Down syndrome.^[1]

References

^ ^a ^b Donnelly, Lane F. (2016-08-10). Fundamentals of Pediatric Imaging E-Book. Elsevier Health Sciences. p. 22. ISBN 9780323444996.

Oral and maxillofacial pathology

Lips
Cheilitis Actinic Angular Plasma cell Cleft lip Congenital lip pit Eclabium Herpes labialis Macrocheilia Microcheilia Nasolabial cyst Sun poisoning Trumpeter's wart

Tongue
Ankyloglossia Black hairy tongue Caviar tongue Crenated tongue Cunnilingus tongue Fissured tongue Foliate papillitis Glossitis Geographic tongue Median rhomboid glossitis Transient lingual papillitis Glossoptosis Hypoglossia Lingual thyroid Macroglossia Microglossia Rhabdomyoma

Palate
Bednar's aphthae Cleft palate High-arched palate Palatal cysts of the newborn Inflammatory papillary hyperplasia Stomatitis nicotina Torus palatinus

Oral mucosa – Lining of mouth

Teeth (pulp, dentin, enamel)

Periodontium (gingiva, periodontal ligament, cementum, alveolus) – Gums and tooth-supporting structures

Periapical, mandibular and maxillary hard tissues – Bones of jaws

Temporomandibular joints, muscles of mastication and malocclusions – Jaw joints, chewing muscles and bite abnormalities
Bruxism Condylar resorption Mandibular dislocation Malocclusion Crossbite Open bite Overbite Overeruption Overjet Prognathia Retrognathia Scissor bite Maxillary hypoplasia Temporomandibular joint dysfunction Condylar hypoplasia Condylar hyperplasia

Salivary glands

Stomatognathic system – Teeth, jaws, tongue and associated soft tissues
Bruxism Mouth breathing Sleep apnea Catathrenia Central hypoventilation syndrome Obesity hypoventilation syndrome Obstructive sleep apnea Periodic breathing Snoring

Orofacial soft tissues – Soft tissues around the mouth
Actinomycosis Angioedema Basal cell carcinoma Cutaneous sinus of dental origin Cystic hygroma Gnathophyma Ludwig's angina Macrostomia Melkersson–Rosenthal syndrome Microstomia Noma Oral Crohn's disease Orofacial granulomatosis Perioral dermatitis Pyostomatitis vegetans

Other
Eagle syndrome Hemifacial hypertrophy Facial hemiatrophy Oral manifestations of systemic disease

source: http://en.wikipedia.org/wiki/Glossoptosis