Which of the following is a cytological feature of Endocervical Adenocarcinoma in situ (AIS)?
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Correct answer: Columnar clusters with 'feathering' and crowding
AIS is the precursor to invasive endocervical adenocarcinoma. Cytologically, it appears as hyperchromatic crowded groups of columnar cells that often exhibit 'feathering' (nuclei protruding from the edges of the cluster).
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