The study of individual cells and their structure, function, and abnormalities. In medicine, it's used to diagnose diseases by examining cells from body fluids, scraping, or fine needle aspirates, such as Pap smears for cervical cancer screening.
From Greek 'kytos' (cell, hollow vessel) and 'logos' (study). The field emerged in the 19th century when cell theory was established, but medical cytology developed in the 20th century with techniques for collecting and examining individual cells for disease diagnosis.
Cytologists can diagnose cancer from just a few cells collected with a tiny brush or needle - they're trained to spot subtle changes in cell shape, size, and internal structures that indicate disease. The famous Pap smear has prevented millions of deaths by detecting cervical cancer cells before they become invasive, making cytology one of medicine's greatest success stories!
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