Biopsy not definitive?

I thought this was worth repeating ....
http://www.meddean.luc.edu/lumen/MedEd/Radio/sarc/sarc3.htm

HISTOLOGIC
A definitive diagnosis requires the histologic identification of noncaseating granulomas. Histology by itself, however, is not sufficient to make the diagnosis of sarcoidosis because a variety of infections and other diseases including malignancies are also associated with noncaseating granulomas. The histologic diagnosis of sarcoidosis is one of exclusion. The biopsy must be considered in conjuction with clinical, radiograph, and laboratory data in order to arrive at a correct diagnosis.