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"Cell-block" technique for fine needle aspiration biopsy.

Fine needle aspiration biopsy for the diagnosis of various neoplastic lesions is a well established procedure.' However, its use is still far from being universal, probably because of the pathologists' unfamiliarity with the type of cellular elements in the cytological preparations of aspirated material. The technique described below reduces the aspirates to the accustomed formalin-shrunken appearance of cells and tissues stained with one's own routine histological stain.