Collision of pigmented benign tumours: a possible simulator of melanoma.

  title={Collision of pigmented benign tumours: a possible simulator of melanoma.},
  author={M Carmen Gonzalez-Vela and Jos{\'e}-Fernando Val-Bernal and Marcos A. Gonz{\'a}lez‐L{\'o}pez and Mariona Novell and H{\'e}ctor Fern{\'a}ndez‐Llaca},
  journal={Acta dermato-venereologica},
  volume={88 1},
The coexistence of more than one neoplasm in a single cutaneous specimen is relatively uncommon and has been defined as a collision or compound tumour (1, 2). Although some of these collision tumours may arise from the involvement of related cell types, most occur by chance (1). Melanocytic naevus has been reported as occurring associated with several different tumour types (1, 3). The association of a melanocytic naevus arising contiguously with or adjacent to seborrhoeic keratosis is, however… 

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