highly significantp < 0.001
Grouped morphological parameters When each of the parameters was split into quartiles (equal number of cases in each group), there were highly significant differences in terms of overall survival (OS) and melanoma‐specific survival (MSS) for tumour area ( p < 0.001 and p < 0.001, respectively) and perimeter ( p < 0.001 and p < 0.001, respectively).