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Signet-ring squamous cell carcinoma: a case report

E McKinley1, R Valles, R Bang

  • 1Department of Pathology, UNM School of Medicine, Albuquerque, New Mexico 87131, USA.

Journal of Cutaneous Pathology
|April 29, 1998
PubMed
Summary
This summary is machine-generated.

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This study reports a rare case of signet-ring squamous cell carcinoma, a unique skin cancer variant. Immunohistochemical analysis aided in distinguishing this rare diagnosis from other skin tumors.

Area of Science:

  • Dermatopathology
  • Oncology

Background:

  • Cutaneous squamous cell carcinoma (cSCC) is a common skin malignancy.
  • Rare variants of cSCC present diagnostic challenges.

Observation:

  • A 50-year-old man presented with a neck lesion exhibiting intra-epidermal and invasive dermal cells with a signet-ring appearance.
  • Histopathology revealed features suggestive of cSCC, with signet-ring morphology.
  • Immunohistochemical staining demonstrated keratin expression and focal glycogen positivity, with negative mucicarmine stains.

Findings:

  • The lesion was diagnosed as signet-ring squamous cell carcinoma based on unique cellular morphology and immunohistochemical profile.
  • Ultrastructural examination identified dilated endoplasmic reticulum as the source of the signet-ring vacuoles.

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  • Immunohistochemistry was crucial in differentiating this rare cSCC variant from other clear cell and signet-ring tumors.

    • Implications:

    • This case highlights the importance of considering rare variants in the differential diagnosis of skin neoplasms.
    • Accurate diagnosis of signet-ring cSCC is essential for appropriate patient management.
    • Further research into the pathogenesis and behavior of signet-ring cSCC may be warranted.