The reversible replacement of one differentiated cell type with another mature differentiated cell type, typically as an adaptive response to chronic irritation or inflammation. It represents a protective mechanism but can predispose to malignancy in some cases.
From Greek 'meta' meaning 'change' or 'transformation' and 'plasis' meaning 'formation' or 'molding.' The term describes the transformation of one type of tissue into another type.
Barrett's esophagus is a classic example of metaplasia where the normal esophageal lining transforms into intestinal-type cells to better handle acid reflux - it's like your body renovating a room with more durable materials! While protective initially, this change can sometimes progress to cancer, which is why we monitor these patients closely.
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