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Atypical mitoses: morphology and classification.

The number and type of mitoses observed in cytologic and histologic preparations are often used as criteria of malignancy. However, descriptions of atypical mitoses are not readily available, and mistakes in identifying them are frequent as evidenced by 2 surveys of pathologists in human medicine. A similar test administered to several veterinary clinical pathologists by the author showed poor agreement on identification of abnormal mitoses, indicating limited understanding and inconsistency in identifying or naming them. Descriptions of mitotic figures found in routine cytologic and histologic specimens are presented here as a reference for veterinary cytopathologists, mainly using a recently proposed classification system for chromosome segregation errors in cancer, in order to improve accuracy and consistency in identifying and naming normal and abnormal mitoses. As pathologists we love to show pictures of mitoses; we should describe them as correctly as possible.