“…As to the previous cases, in the 14 cases where followup was indicated, five patients had died of the disease and three had metastases. 5,6,8,9,[12][13][14][15]18,19,21,24,25 Many of these cases had delayed diagnoses and the tumour was deeply invasive at the time of excision. In these cases, the lack of pigment within the lesion may have been the cause of the delayed diagnosis.…”