U.S. flag

An official website of the United States government


Send to:

Choose Destination

Proximal/middle symphalangism of 5th finger

MedGen UID:
Concept ID:
Synonyms: Proximal 5th finger symphalangism; Proximal fifth finger symphalangism
HPO: HP:0009177


Fusion of the proximal and middle phalanges of the 5th finger. [from HPO]

Term Hierarchy

Conditions with this feature

Symphalangism-brachydactyly syndrome
MedGen UID:
Concept ID:
Disease or Syndrome
Multiple synostoses syndrome is characterized by multiple joint fusions, usually commencing in the hands, conductive deafness, and characteristic facial features, including a broad, tubular-shaped nose and a thin upper vermilion. Other features include brachydactyly, hypoplastic or absent middle phalanges, radial head dislocation, and pectus carinatum (summary by Takahashi et al., 2001). Genetic Heterogeneity of Multiple Synostoses Syndrome Other forms of multiple synostoses syndrome include SYNS2 (610017), caused by mutation in the GDF5 gene (601146) on chromosome 20q11; SYNS3 (612961), caused by mutation in the FGF9 gene (600921) on chromosome 13q12; and SYNS4 (617898), caused by mutation in the GDF6 gene (601147) on chromosome 8q22.
Mesoaxial synostotic syndactyly with phalangeal reduction
MedGen UID:
Concept ID:
Disease or Syndrome
Mesoaxial synostotic syndactyly with phalangeal reduction (MSSD) represents a distinctive combination of clinical features that includes mesoaxial osseous synostosis at a metacarpal level, reduction of one or more phalanges, hypoplasia of distal phalanges of preaxial and postaxial digits, clinodactyly of fifth fingers, and preaxial fusion of toes (Malik et al., 2014).
Talonavicular coalition
MedGen UID:
Concept ID:
Congenital Abnormality
Stapes ankylosis with broad thumbs and toes
MedGen UID:
Concept ID:
Disease or Syndrome
This syndrome has characteristics of congenital conductive deafness due to stapes ankylosis, broad thumbs and first toes and hyperopia. So far, it has been described in multiple members of six families. Other skeletal malformations were also reported including short distal phalanges and syndactyly, but symphalangism is usually absent. Transmission is autosomal dominant and the syndrome is caused by mutations in the NOG gene (17q22).
Symphalangism, proximal, 1B
MedGen UID:
Concept ID:
Disease or Syndrome
Any proximal symphalangism in which the cause of the disease is a mutation in the GDF5 gene.
Autosomal recessive Robinow syndrome
MedGen UID:
Concept ID:
Disease or Syndrome
ROR2-related Robinow syndrome is characterized by distinctive craniofacial features, skeletal abnormalities, and other anomalies. Craniofacial features include macrocephaly, broad prominent forehead, low-set ears, ocular hypertelorism, prominent eyes, midface hypoplasia, short upturned nose with depressed nasal bridge and flared nostrils, large and triangular mouth with exposed incisors and upper gums, gum hypertrophy, misaligned teeth, ankyloglossia, and micrognathia. Skeletal abnormalities include short stature, mesomelic or acromesomelic limb shortening, hemivertebrae with fusion of thoracic vertebrae, and brachydactyly. Other common features include micropenis with or without cryptorchidism in males and reduced clitoral size and hypoplasia of the labia majora in females, renal tract abnormalities, and nail hypoplasia or dystrophy. The disorder is recognizable at birth or in early childhood.

Supplemental Content

Table of contents

    Clinical resources

    Consumer resources

    Recent activity

    Your browsing activity is empty.

    Activity recording is turned off.

    Turn recording back on

    See more...