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Onycholemmal carcinoma.

Elvio Alessi1, Antonella Coggi, Raffaele Gianotti

  • 1Institute of Dermatological Sciences, University of Milan-IRCCS Ospedale Maggiore of Milan, Milan, Italy. elvio.alessi@unimi.it

The American Journal of Dermatopathology
|September 15, 2004
PubMed
Summary
This summary is machine-generated.

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A rare malignant tumor, onycholemmal carcinoma, was identified in the nail bed epithelium of a 69-year-old male. Surgical removal resulted in no recurrence or metastasis over four years.

Area of Science:

  • Dermatopathology
  • Oncology

Background:

  • Nail bed tumors are rare, and their epithelial origins require precise classification for effective treatment.
  • Understanding the differentiation of nail bed epithelium is crucial for diagnosing related malignancies.

Observation:

  • A slowly growing malignant tumor of the nail bed epithelium was observed in a 69-year-old male patient.
  • Microscopic examination revealed atypical squamous epithelium forming cysts and solid nests invading dermal and bone structures.
  • The tumor exhibited features analogous to trichilemmal carcinoma.

Findings:

  • The tumor was characterized by atypical keratinocytes, keratin-filled cysts, and invasion into the phalangeal bone.
  • Histological comparison to the hair follicle's outer root sheath (trichilemma) informed the proposed designation.

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  • Surgical excision via phalanx disarticulation was curative.

    • Implications:

    • The proposed term 'onycholemmal carcinoma' provides a specific diagnostic category for this nail bed malignancy.
    • This case highlights the importance of considering hair follicle sheath analogies in nail bed tumor pathology.
    • Successful surgical management suggests a favorable prognosis for onycholemmal carcinoma when completely resected.