FNA vs. FNB | 合法醫療器材資訊網

Pathologists look at tissue samples two different ways: FNA or FNB. FNA shows tissue samples at the cellular level, with slides prepared in Cytolyt. When using FNB, the sample is that of an intact core sample, revealing the true architecture of the tissue, which is preserved in Formalin. FNB does not improve the diagnostic yield of malignancy compared with FNA. However, the ability to obtain histologic specimens can aid in diagnosing benign conditions such as autoimmune or chronic pancreatitis, in which the assessment of tissue architecture is necessary to achieve a diagnosis. In addition, EUS-FNB should be considered in lesions with prior non-diagnostic EUS.

Compare the slides showing the differences between FNA and FNB from a pathologist’s perspective. The sample came from a 65-year-old man with a pancreatic mass in the head of the pancreas with EUS. EUS showed a well-defined round-shaped and slightly...