Diagnostic and exfoliative cytology has today achieved a status that few could have envisaged 20 years ago. While exfoliative cytology has long been employed in gynecological diagnosis, new and rewarding spheres have now developed in which cytological diagnosis plays an important role. Exfoliative cytology, for example, is widely employed as an aid in the continuous assessment of urinary tract tumors, and aspiration cytology in the diagnosis of thyroid dis eases. This has given rise to a growing demand for pathologists experienced in cytological diagnosis. However, clinicians with an interest...