What is the term for marked by abnormal adult cells?

Dysplasia refers specifically to the presence of abnormal cells within a tissue or organ. These cells exhibit variations in size, shape, and organization compared to normal cells, indicating a potential precursor to cancer or other pathological conditions. Dysplasia is a deviation from normal cell structure and function, often associated with tissue that has undergone stress or injury.

Hyperplasia, on the other hand, involves an increase in the number of normal cells in a tissue or organ, leading to its enlargement, but the cells themselves remain normal in appearance. Metaplasia is the process whereby one type of adult cell is replaced by another type of adult cell, often as an adaptive mechanism in response to chronic irritation or injury. Aplasia refers to the absence of normal cell development and tissue formation, leading to underdeveloped or absent tissues.