Dermoscopy quiz ยท Case 2610011 by Julien Anriot

This is a lesion on the trunc of a 57-year-old man.

Lesion discovered during routine screening

Clinical photograph

Interesting discussion so far! Some of you interpret this as a collision lesion, while others see melanoma-specific clues.

For those favoring a collision lesion: Which dermoscopic findings support two distinct components, and which features would make you reconsider?

For those favoring melanoma: Which single finding carries the greatest diagnostic weight?

I'd be particularly interested in how you apply the concept of chaos in this case.

I'll discuss these interpretations in the upcoming case resolution on wednesday

What is the most likely diagnosis?

  • Nevus

  • BCC

  • SCC

  • Melanoma including Melanoma in situ

Which dermoscopic finding most influenced your decision, and why? Share your reasoning in the comments.