Diagnostic Exercise 1

Case 9 (a)

This photograph is from a pig. There is a piece of black skin and then a segment of alimentary canal and a lesion.

• What specifically is the lesion?
• What is its likely etiology and pathogenesis?

• Did you recognize anus?
• The structure????
• The ulcerated mucosa just proximal to the stricture?
• The colonic dilatation?