Dorsal dermal sinus

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[edit] Discussion of Dorsal dermal sinus

  • A dorsal dermal sinus is an epithelium-lined tract from the skin to the spinal cord, cauda equina, or arachnoid.
  • Predominantly located in the lumbosacral region and less often in the occipital region.
  • Dorsal dermal sinus is caused by incomplete separation of the superficial ectoderm from the neural ectoderm, resulting in a focal segmental adhesion.
  • Later during embryogenesis, the spinal cord ascends relative to the spinal canal and stretches the adhesion into a long, tubular tract.

  • Dorsal dermal sinus manifests as a small dimple or pinpoint ostium, which is often associated with an area of hyperpigmented, angiomatous skin or hypertrichosis and occurs in a midline location or rarely in a paramedian location.
  • Soft-tissue asymmetry and bone anomalies are common findings.
  • Typical complications are infections such as recurrent meningitis, epidural or subdural abscess, and intramedullary spinal cord abscess.
  • Dorsal dermal sinus occurring in a paramedian location is often associated with an intraspinal dermoid or Epidermoid, which causes compression of neural structures with neurologic symptoms.

[edit] Imaging Findings for Dorsal dermal sinus

  • US can show the entire length of the tract from the skin to the spinal cord.
  • The tract can be difficult to identify within the subcutaneous fat.
  • The tract is clearly demonstrated in the anechoic, cerebrospinal fluid–filled subarachnoid space as an echogenic structure.

[edit] Images

Patient #1

[edit] See Also

[edit] External Links

Goldminer: Dorsal dermal sinus

[edit] References for Dorsal dermal sinus