Metaplasia

Metaplasia

File:Bronchiolar metaplasia (5925741253).jpg

Histopathological image showing metaplasia in tissue samples.

Metaplasia is a pathological condition characterized by the transformation of one differentiated cell type to another differentiated cell type. This abnormal tissue change often occurs as an adaptive response to a chronic stimulus.

Definition and Types

Metaplasia can be classified into several types based on the tissue transformation:

• Epithelial Metaplasia: Changes in epithelial cell types, such as squamous metaplasia in the respiratory tract.
• Mesenchymal Metaplasia: Transformation of mesenchymal tissue, like bone formation in soft tissue.

Causes

Common causes of metaplasia include:

• Chronic irritation or inflammation
• Hormonal changes
• Environmental factors, such as smoking

Clinical Significance

Metaplasia is significant clinically as it can be a precursor to dysplasia and malignant transformations. However, not all metaplastic changes lead to cancer.

Potential for Malignancy

File:Squamous metaplasia - Pap test - alt -- very high mag.jpg

Biopsy, a procedure used to diagnose potential malignant changes in metaplastic tissue.

While metaplasia is initially a benign process, chronic conditions leading to persistent metaplasia can increase the risk of developing malignancy in the affected tissues.

External Links

• National Cancer Institute - Definition of Metaplasia
• National Center for Biotechnology Information - Metaplasia

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