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Cell block immunohistochemistry (IHC) and other molecular studies are often required to fully characterise tumours diagnosed by fine needle aspiration (FNA) cytology. These supplementary investigations are best done on cell blocks. We describe a device that allows cell blocks to be collected while performing FNAs with little extra effort or reduction in the quality of the cytology smear specimen. Experienced FNA operators will recognise that often a significant amount of the sample is left behind in the hub of the needle when the specimen is ejected on the slides (figure 1A).
Competing interests The author has discussed the production of the device with a medical equipment company. The device should be commercially available by late 2012.
Provenance and peer review Not commissioned; externally peer reviewed.
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