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Regressing malignant melanoma

W D Grafton1

  • 1Louisiana State University School of Medicine, Shreveport 71130.

The Journal of the Louisiana State Medical Society : Official Organ of the Louisiana State Medical Society
|December 1, 1994
PubMed
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Spontaneous regression of malignant melanoma can complicate diagnosis. Recognizing partial regression requires identifying specific cellular and architectural features, aiding in accurate clinical and pathological assessment.

Area of Science:

  • Dermatology
  • Oncology
  • Pathology

Background:

  • Malignant melanoma can exhibit spontaneous regression, a phenomenon that complicates accurate diagnosis.
  • Complete spontaneous regression is typically diagnosed retrospectively after metastasis presentation.
  • Partial regression presents diagnostic challenges as regressed areas lose melanoma characteristics.

Observation:

  • Two cases of malignant melanoma with partial regression are presented.
  • Definitive diagnosis relies on identifying at least two of three key features: atypical melanocytic cells, mitoses, or epidermal invasion.
  • Clinical signs include color changes (depigmentation), color variation, and size reduction.
  • Histopathologic indicators of regression involve epidermal melanin loss, dermal melanophages, capillary telangiectasia, and band-like lymphocytic infiltration.

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Findings:

  • Partial regression obscures definitive melanoma identification in affected areas.
  • Histologic features of regression can mimic inflammatory conditions like lichen planus or regressing nevi.
  • The study highlights the diagnostic criteria for melanoma in partially regressed lesions.

Implications:

  • Accurate diagnosis of regressing melanoma is crucial for timely and appropriate patient management.
  • Understanding regression features aids pathologists in differentiating melanoma from benign or inflammatory mimics.
  • This research emphasizes the importance of comprehensive histopathologic evaluation in challenging melanoma cases.