Rare diseases · Sign or symptom
Triangular face
Face with broad temples and narrow chin
HP:0000325
What it means
Facial contour, as viewed from the front, triangular in shape, with breadth at the temples and tapering to a narrow chin.
Several groups have used the term inverted triangular face to emphasize the fact that the point is facing downwards.
Rare diseases that can present with this72
Very common80–99%
22- 3M syndrome
- Aortic arch anomaly-facial dysmorphism-intellectual disability syndrome
- Autosomal recessive faciodigitogenital syndrome
- Cerebellar ataxia-ectodermal dysplasia syndrome
- Cutaneous mastocytosis-deafness-microtia syndrome
- Distal duplication 18q syndrome
- Mevalonic aciduria
- Multicentric carpo-tarsal osteolysis with or without nephropathy
- Nicolaides-Baraitser syndrome
- Noonan syndrome
- Partington syndrome
- Permanent neonatal diabetes mellitus-pancreatic and cerebellar agenesis syndrome
- Silver-Russell syndrome
- Silver-Russell syndrome due to an imprinting defect of 11p15
- Silver-Russell syndrome due to a point mutation
- Trichorhinophalangeal syndrome type 1
- Trisomy 18 syndrome
- Wiedemann-Rautenstrauch syndrome
- X-linked intellectual disability, Golabi-Ito-Hall type
- X-linked intellectual disability-hypotonia-facial dysmorphism-aggressive behavior syndrome
- X-linked mandibulofacial dysostosis
- Xq12-q13.3 duplication syndrome
Common30–79%
26- 17p11.2microduplication syndrome
- 17q24.2microdeletion syndrome
- 3-hydroxyisobutyric aciduria
- Alazami syndrome
- Arthrogryposis-oculomotor limitation-electroretinal anomalies syndrome
- Blepharophimosis-intellectual disability syndrome, MKB type
- Brachymorphism-onychodysplasia-dysphalangism syndrome
- Bruck syndrome
- Deafness-epiphyseal dysplasia-short stature syndrome
- Distal 17p13.1 microdeletion syndrome
- Distal deletion 15q syndrome
- Floating-Harbor syndrome
- Hypotonia-speech impairment-severe cognitive delay syndrome
- KBG syndrome
- Maternal uniparental disomy of chromosome 20 syndrome
- Maternal uniparental disomy of chromosome 6 syndrome
- Mosaic variegated aneuploidy syndrome
- Ring chromosome 15 syndrome
- Ring chromosome 3 syndrome
- Short stature, Brussels type
- Silver-Russell syndrome due to 11p15 microduplication
- Silver-Russell syndrome due to maternal uniparental disomy of chromosome 11
- Silver-Russell syndrome due to maternal uniparental disomy of chromosome 7
- Spondylodysplastic Ehlers-Danlos syndrome
- Van den Ende-Gupta syndrome
- X-linked intellectual disability-acromegaly-hyperactivity syndrome
Sometimes5–29%
22- 12q14microdeletion syndrome
- 16q24.3microdeletion syndrome
- 20q11.2microduplication syndrome
- 20q13.33microdeletion syndrome
- Andersen-Tawil syndrome
- Autosomal dominant cutis laxa
- Developmental delay-facial dysmorphism syndrome due to MED13L deficiency
- Distal 22q11.2 microduplication syndrome
and 14 more in this range
The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.
Part of the broader category
Also called: Inverted triangular face · Triangular facial shape · Triangular facies
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Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.