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Related Experiment Videos

Parotid involvement by desmoplastic melanoma

T A Jennings1, N T Okby, K R Schroer

  • 1Department of Pathology and Laboratory Medicine, Albany Medical College, New York 12208, USA.

Histopathology
|August 1, 1996
PubMed
Summary

Desmoplastic malignant melanoma can spread to the parotid gland via neurotropic pathways. Pathologists may misdiagnose these tumors as malignant schwannomas without clinical context.

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Area of Science:

  • Oncology
  • Dermatology
  • Pathology

Background:

  • Desmoplastic malignant melanoma (DMM) typically affects sun-damaged skin on the head and neck.
  • Neurotropism is a common feature of DMM.
  • While parotid gland metastasis is known, direct spread is rare.

Purpose of the Study:

  • To investigate the occurrence and characteristics of desmoplastic malignant melanoma involving the parotid gland.
  • To differentiate DMM from other parotid tumors, particularly malignant schwannoma.

Main Methods:

  • Retrospective analysis of five cases of parotid gland involvement by DMM.
  • Clinical and pathological review, including immunohistochemistry and electron microscopy.
  • Assessment of neurotropism and precursor cutaneous lesions.

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Main Results:

  • Four of five cases had precursor cutaneous lesions.
  • Parotid involvement was tumorous in four cases, often unsuspected clinically.
  • Histologically, all cases appeared sarcomatoid with prominent neurotropism.
  • Immunohistochemistry and electron microscopy suggested schwannian differentiation (S-100+, vimentin+, cytokeratin-, HMB-45-), lacking melanogenesis evidence.

Conclusions:

  • DMM can involve the parotid gland through neurotropic spread.
  • Histopathological features of DMM in the parotid can mimic malignant schwannoma.
  • Clinical information is crucial to avoid misdiagnosis of parotid DMM.