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Pseudoachondroplasia (PSACH) is a genetic disorder causing severe dwarfism and skeletal deformities. This case highlights early-onset symptoms in a child born to unaffected parents, emphasizing characteristic radiographic findings.

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Area of Science:

  • Genetics
  • Skeletal Dysplasias
  • Pediatric Orthopedics

Background:

  • Pseudoachondroplasia (PSACH) is an autosomal dominant skeletal dysplasia caused by mutations in the COMP gene.
  • It leads to rhizomelic dwarfism, limb and vertebral deformities, joint laxity, and early-onset osteoarthritis.
  • This report details a severe, early-expressed case of PSACH in a child of unaffected parents.

Observation:

  • A 6.5-year-old girl presented with severe short-limbed dwarfism (height 79.5 cm, <-32% P5) and normal craniofacial features.
  • Growth retardation began at 3 months, with progressive rhizomelic dwarfism, genu varum, lumbar lordosis, and abnormal gait after walking commenced at 15 months.
  • Clinical features included short forearms, brachydactyly, ulnar deviation of hands, and joint hyperlaxity.

Findings:

  • Radiographic examination revealed markedly flared metaphyses, small and irregular epiphyses, and poorly formed acetabulum.
  • These findings are characteristic of PSACH, differentiating it from other skeletal dysplasias.
  • The case underscores the genetic basis and phenotypic variability of PSACH.

Implications:

  • Early diagnosis of PSACH is crucial for managing skeletal deformities and associated complications.
  • Understanding the genetic underpinnings of PSACH aids in genetic counseling and potential therapeutic strategies.
  • This case contributes to the literature on severe, early-onset presentations of pseudoachondroplasia.