
Clinical information
Case 56B
Female, 20 years. Irregular recurrent pig lesion back
Diagnosis:
Recurrent naevus after incomplete excision (Case 56A)
Comments:
RECURRENT NAEVUS
- History of removal of banal naevus
- Interval usually weeks to months (in contrast to recurent melanoma: local recurrence usually after years)
- Scar tissue in upper dermis, with slightly enlarged and usually pigmented melanocytes, in compact nests
- Irregular distribution of similar pigmented naevoid melanocytes in overlying neoepidermis
- Very often an entirely banal looking naevus remnant in the pre-existent dermis bordering the scar
- Re-examination of histology of previously removed naevus, if available, is important to confirm the diagnosis
- Some of these benign lesions are macroscopically irregular and therefore suspicious: 'pseudomelanoma' of Ackerman.
Reference:
Fox et al., Arch Pathol Lab Med 2011; 135: 842-6






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