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[Achondrogenesis type II-hypochondrogenesis: radiological features.Case report].

J Delgado Carrasco1, A Casanova Morcillo, M Zabalza Alvillos

  • 1Sección de Radiodiagnóstico Pediátrico.Hospital General Universitario Gregorio Marañón. Universidad Complutense. Madrid.

Anales Espanoles De Pediatria
|December 4, 2001
PubMed
Summary

This case study details lethal hypochondrogenesis, a severe skeletal dysplasia diagnosed in a neonate. Clinical and radiological findings were crucial for diagnosis due to the absence of molecular studies.

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Area of Science:

  • Medical Genetics
  • Skeletal Dysplasias
  • Neonatal Medicine

Background:

  • Lethal skeletal dysplasias represent a group of severe congenital disorders affecting bone and cartilage development.
  • Hypochondrogenesis is a rare, severe form of chondrodysplasia characterized by extreme micromelia and a large cranium.
  • Mutations in the COL2A1 gene, encoding collagen type II, are implicated in a spectrum of skeletal dysplasias, including hypochondrogenesis and achondrogenesis II.

Observation:

  • A neonate presented with suspected lethal dysplasia, identified via prenatal ultrasonography showing shortened extremities, a large head, and polyhydramnios.
  • Postnatal examination revealed platyspondylic dwarfism, short limbs, a narrow chest, and a hydropic appearance.
  • The infant experienced progressive respiratory distress and expired on the third day of life.

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Findings:

  • Clinical and radiological findings strongly suggested hypochondrogenesis, despite the lack of histological, chondro-osseus, and molecular analyses.
  • The condition is understood to be part of a collagen type II abnormality spectrum, linked to mutations in the COL2A1 gene on chromosome 12.
  • Autosomal dominant inheritance is observed in heterozygotes, with phenotype variability dependent on mutation specifics.

Implications:

  • This case highlights the importance of detailed clinical and radiological assessments in diagnosing lethal neonatal skeletal dysplasias when advanced molecular studies are unavailable.
  • Understanding the genetic basis, particularly COL2A1 mutations, aids in classifying and diagnosing various collagen type II-related chondrodysplasias.
  • Further research into genotype-phenotype correlations can improve diagnostic accuracy and genetic counseling for affected families.