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Type 1.5 Split Cord Malformations: An Uncommon Entity.

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Area of Science:

  • Developmental Biology
  • Neurology
  • Pediatric Surgery

Background:

  • Split cord malformations (SCMs) are rare congenital spinal anomalies.
  • Pang et al.'s unified theory (1992) explains SCM types 1 and 2 formation.
  • Some SCM cases challenge the existing classification and embryogenesis theory.

Observation:

  • An 11-year-old boy presented with low backache and a midline ventral bony spur at D12-L1.
  • Imaging revealed a low-lying tethered cord within a single dural sac encasing two hemicords.
  • Surgical exploration confirmed a ventral bony spur with two hemicords within one dural tube.

Findings:

  • The reported SCM case presented features not aligning with the established type 1 or type 2 classification.
  • The authors propose a new category, 'type 1.5 SCMs', for cases exhibiting characteristics of both types.
  • SCMs may represent a spectrum of developmental changes occurring between 20-30 days of gestation.

Implications:

  • The proposed 'type 1.5 SCMs' nomenclature aims to reduce confusion and standardize reporting of these anomalies.
  • This classification may better accommodate SCMs with mixed features.
  • Further research is needed to validate the embryologic basis and clinical implications of this proposed classification.