12.   63 yr old man with a rapidly-evolving plaque in the skin of the left neck, present for 3 weeks.

Diagnosis = Metastatic intracutaneous adenocarcinoma of distal esophagus, arising in Barrett's esophagus

(Mouse-swipe links below, right-click, & choose "Open Link")

http://emedicine.medscape.com/article/1101058-overview

https://en.wikipedia.org/wiki/Esophageal_cancer