There are so many things wrong with this story, not the least which Yaah pointed out.
This article goes to show how little people really know about Pathology. You want to get even more irate? Read some of the comments at the bottom of the article by the general public. The pathologist should be sued or even lose their license for not diagnosing Crohn's based on one apparently small granuloma?
First off, anyone that has sat behind a microscopic and issued a diagnosis for any appreciable amount of time has made an error. Everyone! We all have error rates in pathology. Granted the big name out at an East Coast School may have an error rate of 1 in 300 while Joe Schmoe out in a private practice in Nebraska may be at 1 in 70 but it is a fact of life.
I have been fortunate to be at an institution that gets a number of cases for second opinion initially diagnosed at an outside hospital, including major academic institutions, where the pathologist that issued the initial diagnosis was a big name in the field (i.e. numerous powerhouse publications and books) and had a major error (one that impacts patient prognosis and/or therapy). We all strive to always be right but the fact is a pathology biopsy has a sensitivity and specificity attached to it that is multifactorial. It is the clinicians responsibility to integrate all of the lab findings and clinical picture and know this fact. A negative biopsy does not necessarily mean the person does not have a disease. It means based on the biopsy given there is not enough evidence to warrant a specific diagnosis. If a patient's symptoms persist and are this bad, maybe the clinician should consider another option including rebiopsy.
The problem with error in pathology is that there is no gold standard to base it on. Right now the way we tell error from accuracy is by precision. Out of 10 big wig pathologists which diagnosis is the most common. Is that really scientific? Probably not, but it is the best we have.