[The certainty of biopsies in the diagnosis of tumors]

Wrong or incorrect tumour biopsy diagnosis is often found out by second reading before starting treatment. But overlooked malignancies can escape as well as malignant tumour mistaken for another causing biased treatment with complications. A collection of 59 bioptic mistakes showed not only dispersion but repetition of some of them in nosologic groups. A detailed attention was paid to them and their prevention was recommended. A claim to reproducibility of conclusions represents a withdrawal from presumed clearly empiric nature of bioptic diagnosis.