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Pacman dysplasia

MedGen UID:
331566
Concept ID:
C1833676
Disease or Syndrome
Synonyms: Epiphyseal stippling with osteoclastic hyperplasia; Pacman syndrome
SNOMED CT: Pacman dysplasia (722127006); Epiphyseal stippling with osteoclastic hyperplasia syndrome (722127006)
Modes of inheritance:
Autosomal recessive inheritance
MedGen UID:
141025
Concept ID:
C0441748
Intellectual Product
Source: Orphanet
A mode of inheritance that is observed for traits related to a gene encoded on one of the autosomes (i.e., the human chromosomes 1-22) in which a trait manifests in individuals with two pathogenic alleles, either homozygotes (two copies of the same mutant allele) or compound heterozygotes (whereby each copy of a gene has a distinct mutant allele).
 
Monarch Initiative: MONDO:0008175
OMIM®: 167220
Orphanet: ORPHA1952

Definition

Pacman dysplasia has characteristics of epiphyseal stippling and osteoclastic overactivity. It has been described in less than 10 patients but may be underdiagnosed. The syndrome may be inherited as an autosomal recessive trait. In order to make a definitive diagnosis, lysosomal storage should be investigated by electron microscopy, or enzyme assays should be performed. Familial recurrence can be easily detected by prenatal ultrasonography. This skeletal dysplasia is lethal. [from SNOMEDCT_US]

Clinical features

From HPO
Bowing of the long bones
MedGen UID:
340849
Concept ID:
C1855340
Congenital Abnormality
A bending or abnormal curvature of a long bone.
Epiphyseal stippling
MedGen UID:
349104
Concept ID:
C1859126
Finding
The presence of abnormal punctate (speckled, dot-like) calcifications in one or more epiphyses.
Lethal skeletal dysplasia
MedGen UID:
867266
Concept ID:
C4021626
Anatomical Abnormality

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVPacman dysplasia
Follow this link to review classifications for Pacman dysplasia in Orphanet.

Recent clinical studies

Diagnosis

Saul RA, Proud V, Taylor HA, Leroy JG, Spranger J
Am J Med Genet A 2005 Jun 15;135(3):328-32. doi: 10.1002/ajmg.a.30716. PMID: 15887289
Miller SF, Proud VK, Werner AL, Field FM, Wilcox WF, Lachman RS, Rimoin DL
Pediatr Radiol 2003 Apr;33(4):256-60. Epub 2003 Feb 5 doi: 10.1007/s00247-002-0859-4. PMID: 12709756

Prognosis

Saul RA, Proud V, Taylor HA, Leroy JG, Spranger J
Am J Med Genet A 2005 Jun 15;135(3):328-32. doi: 10.1002/ajmg.a.30716. PMID: 15887289

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