A pathologist by the screen name of WashingtonDeceit has uploaded 544 histopathology videos since he joined YouTube on February 03, 2007. The videos last between 2 and 5 minutes and are professionally made and narrated. I am not an expert in the field but this looks like a useful resource to me.
We are planning to ask the nephrology fellows at the Cleveland Clinic what they think about the renal histopathology videos via a web-based survey (SurveyMonkey.com).
This is one example of the videos:
Histopathology Kidney -- Interstitial nephritis
The author of the videos has agreed to have them embedded in AskDrWiki.
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