text: In one-nine-one-six, patients bein' seen,
  Primary malignant melanoma, skin so keen.
  Excludin' palms, soles, and nailbeds in the mix,
  Microscopic review, Clark's system, no tricks.
  
  Lentigo maligna melanoma, 'bout eighty-five,
  Superficial spreading, one-two-three-four, that's live.
  Nodular melanoma, five-one-three in the zone,
  Differentiation not possible, four percent unknown.
  
  Correlatin' melanoma types, clinical and such,
  Growth rate, nevus, invasive cells, clutch.
  Prognosis too, they all be different, true,
  Distinct entities, cutaneous melanoma crew.
  
  As Clark first described, nodular's the fastest,
  Superficial spreadin', next up, not the lastest.
  Lentigo maligna melanoma, slow and steady,
  Histological typing, this classification's ready.
  
  Applied to most melanomas, it's practical,
  Delineates clinico-pathologic, that's factual.
  Cutaneous melanoma, entities separate,
  Aetiological differences, let's investigate.