Definition: a state in which something is not typical but is abnormal. An abnormal change in a cell may be harmless or harmful. In internal tissues, atypical cells may be considered precancerous.
Also Known As: atypism, atypical
Common Misspellings: atipia, atipical
Examples:If your diagnosis is intraductal hyperplasia with atypia, it means that you have some cells in your milk ducts or nipple aspirate fluid that look different than normal cells and there are more of these cells than expected. A diagnosis of atypia does not always progress to Ductal Carcinoma in situ (DCIS), though.