The surgical pathologist's approach to fine needle aspiration.

The diagnostic process begins with triage of the FNAB, depending on the patient's problem. Portions of the specimen can then be set aside for appropriate immunocytochemistry, hormone receptors analysis, electron microscopy, flow cytometry, or molecular studies. Microscopic evaluation, as in surgical pathology, begins with scanning objective examination of tissue architecture, followed by study of cellular characteristics, and finally the nuclear features. Cytopathology and surgical pathology are no longer distinct entities.