c4tc4k3:

cool hand angiography

An angiography is the imaging of blood vessels, usually by injecting a radio-opaque fluid into the veins and then x-raying them. This patient has a finger angioma, where a benign tumor has developed and resulted in an unusual clogging of vessels.

I think my favorite part is the delicate delta of veins under the thumbnail though.

(Source: http://www.biomedicalblog.com/injectable-gel-promotes-vascularization-in-implanted-tissues/97300/)