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Melanocytic Slide Club Case 201

Melanocytic Slide Club Case 201. Dr Richard A. Carr. M11. Lesion on forearm. Summary of EQA Participant Responses (N=28). Spitz Naevus 10 DPN 2 Blue Naevus 1 Atypical / Borderline 10 Note: includes most of the above responders Melanoma 12 Spitzoid 1 SSMM: 2 LMM 1

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Melanocytic Slide Club Case 201

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  1. Melanocytic Slide ClubCase 201 Dr Richard A. Carr

  2. M11. Lesion on forearm

  3. Summary of EQA Participant Responses (N=28) • Spitz Naevus 10 • DPN 2 • Blue Naevus 1 • Atypical / Borderline 10 • Note: includes most of the above responders • Melanoma 12 • Spitzoid 1 • SSMM: 2 • LMM 1 • Desmoplastic 1 • Malignant Blue 1 • Unclassifiable 4

  4. Results (N=28) • Clark level: • IV 1 • V 12 • Breslow • Median (Range): 4.2 (3.5 to 6.3) • Growth Phase • VGP 12 • RGP 0 • Regression: Y/N 1/11 • Mitotic Rate: • Absent: 1 • Low: 11 • High: 0

  5. Slide Club: Expert Comments Atypical Spitz: “Difficult Spitzoid, Lateral Spread” DPN (UMP): “Manage as melanoma but in view of age and sparse mitoses consider DPN” DPN (UMP): “Difficult - possible atypical deep penetrating naevus- I would suggest uncertain malignant potential as I certainly would not wish to exclude melanoma. History important. Sentinel node would be of interest” Melanoma: “Very tricky case in a child. Has there been previous treatment/trauma?”

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