A modified gastrointestinal (GI) endoscopy that uses stains or dyes to highlight abnormal areas in the mucosa, helping detect cancerous or precancerous lesions.

How it works:

A flexible endoscope is inserted through the mouth (upper GI) or anus (lower GI).

A fine mist of dye is applied to the mucosal lining.

Abnormal cells react differently to the dye, making suspicious areas easier to see for biopsy or removal.