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Discussion Starter · #4 ·
Melanosis Coli

The clue to the answer is that the patient is "healthy".
This is melanosis coli. The pigment is not melanin (common mistake), it's lipofuscin which gets accumulated in melanosis coli.
Melanosis coli has no clinical significance as it can be seen in normal people and the only association in some cases is with laxative abuse.
 

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This is just another proof that's it's impossible to differentiate melanin from hemosiderin from lipofuscin from the microscope only, they must give some clues in the history
 
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