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Primary Cutaneous Enteric Duplication Cyst: A Novel Entity.

Murphy R Mastin1, Leah A Swanson1, Thomas C Smyrk2

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The American Journal of Dermatopathology
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This summary is machine-generated.

This study reports the first case of a primary cutaneous enteric duplication cyst (EDC) found on the hip. This rare congenital malformation, typically found in the abdomen or thorax, presented a diagnostic challenge.

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Area of Science:

  • Gastroenterology
  • Developmental Biology
  • Dermatopathology

Background:

  • Enteric duplication cysts (EDCs) are rare congenital malformations characterized by double-walled cystic or tubular structures.
  • EDCs typically share a common muscular wall and blood supply with adjacent bowel, predominantly occurring intra-abdominally or intrathoracically.

Observation:

  • A 17-year-old male presented with a cystic nodule on the left hip, surgically excised.
  • Histopathology revealed a cyst with dual epithelial linings: mucinous cells and colonic-type mucosa.
  • The cyst possessed a thick muscular wall, mimicking muscularis mucosa and propria.

Findings:

  • The case represents the first documented instance of a primary cutaneous EDC outside the abdominal and thoracic cavities.
  • Immunohistochemical markers (CK7, CK20, CDX2) supported the dual epithelial differentiation.
  • The developmental etiology of this cutaneous EDC remains uncertain.

Implications:

  • This novel presentation of an enteric duplication cyst highlights the potential for ectopic occurrence.
  • The unique histopathological features underscore the diagnostic challenges posed by such rare congenital anomalies.
  • Further research is needed to elucidate the developmental pathways leading to primary cutaneous EDCs.