Total 68 clinical symptoms reported for Treacher Collins syndrome 1  Very Frequent (12)Occasional (37)Frequent (19)

Abnormal facial shape	An abnormal morphology (form) of the face or its components.   Synonyms:Abnormal facial shape; Abnormal morphology of the face; Distinctive facies; Dysmorphic facial features; Dysmorphic facies; Facial dysmorphism; Unusual facial appearance; Unusual facies	Very frequent
Abnormality of bone mineral density	This term applies to all changes in bone mineral density which (depending on severity) can be seen on x-rays as a change in density and or structure of the bone. Changes may affect all bones of the organism, just certain bones or only parts of bones and include decreased mineralisation as may be seen in osteoporosis or increased mineralisation and or ossification as in osteopetrosis, exostoses or any kind of atopic calicfications of different origin and distribution. The overall amount of mineralization of the bone-organ can be measured as the amount of matter per cubic centimeter of bones, usually measured by densitometry of the lumbar spine or hip. The measurements are usually reported as g/cm3 or as a Z-score (the number of standard deviations above or below the mean for the patient's age and sex). Note that measurement with this method does not reflect local changes in other bones, and as such might not be correct with regard the hole bone-organ.   Synonyms:Abnormality of bone mineralisation and ossification	Very frequent
Downslanted palpebral fissures	The palpebral fissure inclination is more than two standard deviations below the mean.   Synonyms:Antimongoloid eye slant; Antimongoloid slant of palpebral fissures; Antimongoloid slanted palpebral fissures; Down slanting palpebral fissures; Down-slanted palpebral fissures; Down-slanting palpebral fissure; Down-slanting palpebral fissures; Downslanting palpebral fissure; Downslanting palpebral fissures; Downward slanted palpebral fissures; Downward slanting of the opening between the eyelids; Downward slanting palpebral fissures; Downward-slanting palpebral fissures; Palpebral fissures down-slanted	Very frequent
Hypoplasia of the maxilla	Abnormally small dimension of the Maxilla. Usually creating a malocclusion or malalignment between the upper and lower teeth or resulting in a deficient amount of projection of the base of the nose and lower midface region.   Synonyms:Decreased size of maxilla; Decreased size of upper jaw; Hypoplasia of upper jaw bones; Hypoplastic maxillary bones; Maxillary deficiency; Maxillary hypoplasia; Maxillary micrognathia; Maxillary retrognathia; Maxillary retrusion; Micromaxilla; Small maxilla; Small upper jaw; Small upper jaw bones; Upper jaw deficiency; Upper jaw retrusion	Very frequent
Hypoplasia of the zygomatic bone	Underdevelopment of the zygomatic bone. That is, a reduction in size of the zygomatic bone, including the zygomatic process of the temporal bone of the skull, which forms part of the zygomatic arch.   Synonyms:Cheekbone underdevelopment; Decreased size of cheekbone; Decreased size of zygomatic bone; Hypoplasia of cheekbone; Underdevelopment of cheekbone; Underdevelopment of zygomatic bone	Very frequent
Malar flattening	Underdevelopment of the malar prominence of the jugal bone (zygomatic bone in mammals), appreciated in profile, frontal view, and/or by palpation.   Synonyms:Decreased size of malar bone; Depressed malar region; Flat cheekbone; Malar hypoplasia; Underdevelopment of malar bone; Zygomatic flattening	Very frequent
Micrognathia	Developmental hypoplasia of the mandible.   Synonyms:Decreased size of lower jaw; Decreased size of mandible; Hypoplasia of lower jaw; Hypoplasia of mandible; Hypoplastic mandible; Hypoplastic mandible condyle; Hypotrophic lower jaw; Hypotrophic mandible; Little lower jaw; Little mandible; Lower jaw deficiency; Lower jaw hypoplasia; Mandibular deficiency; Mandibular hypoplasia; Mandibular micrognathia; Micrognathia of lower jaw; Micromandible; Robin mandible; Severe hypoplasia of mandible; Small jaw; Small lower jaw; Small mandible; Underdevelopment of lower jaw; Underdevelopment of mandible	Very frequent
Midface retrusion	Posterior positions and/or vertical shortening of the infraorbital and perialar regions, or increased concavity of the face and/or reduced nasolabial angle.   Synonyms:Decreased size of midface; Flat midface; Hypoplasia of midface; Midface deficiency; Midface hypoplasia; Midface retrusion; Midface, flat; Retrusive midface; Underdevelopment of midface	Very frequent
Open bite	Visible space between the dental arches in occlusion.   Synonyms:Absence of overlap of upper and lower teeth; Open bite; Open bite between upper and lower teeth	Very frequent
Retrognathia	An abnormality in which the mandible is mislocalised posteriorly.   Synonyms:Lower jaw retrognathia; Lower jaw retrusion; Mandibular retrognathia; Mandibular retrusion; Receding chin; Receding lower jaw; Receding mandible; Retrognathia of lower jaw; Retrusion of lower jaw; Weak chin; Weak jaw	Very frequent
Short face	Facial height (length) is more than two standard deviations below the mean (objective); or an apparent decrease in the height (length) of the face (subjective).   Synonyms:Decreased height of face; Decreased length of face; Decreased vertical dimension of face; Short face; Short facies; Vertical deficiency of face; Vertical Facial Deficiency; Vertical facial insufficiency; Vertical hypoplasia of face; Vertical insufficiency of face; Vertical shortening of face	Very frequent
Skeletal dysplasia	A general term describing features characterized by abnormal development of bones and connective tissues.	Very frequent