Precancerous lesions(adenoma, lesions with dysphasia)

Precancerous lesions in the digestive tract, such as adenomas and dysplastic lesions, are abnormal growths that have the potential to develop into cancer if left untreated. These lesions are commonly found in the colon, stomach, and esophagus, often detected during routine endoscopic screenings. Symptoms may include gastrointestinal bleeding, abdominal discomfort, or changes in bowel habits, though many patients remain asymptomatic. Early detection through endoscopy is crucial, as it allows for timely intervention before malignancy occurs.

Early stage cancer

Early-stage cancers in the digestive tract, such as esophageal, gastric, or colorectal cancer, often develop without noticeable symptoms, making endoscopic screening critical for detection. These cancers are confined to the mucosal or submucosal layers, with minimal risk of lymph node metastasis, allowing for curative minimally invasive treatments. Common risk factors include Helicobacter pylori infection, smoking, and genetic predisposition, with high-incidence regions like East Asia emphasizing routine endoscopic surveillance for high-risk groups.

Submucosal tumors

Submucosal tumors (SMTs) are abnormal growths beneath the mucosal layer of the digestive tract, often detected incidentally during endoscopy. These tumors can arise in the esophagus, stomach, or colon, originating from muscle, fat, or nerve tissues. While most SMTs are benign (e.g., leiomyomas or lipomas), some, like gastrointestinal stromal tumors (GISTs), carry malignant potential. Symptoms, if present, include swallowing difficulties, abdominal discomfort, or bleeding, though many patients remain asymptomatic until the tumor grows larger. Early diagnosis is crucial, and endoscopic ultrasound (EUS) is the primary tool to evaluate tumor size, layer of origin, and malignant features, such as irregular borders or hypoechoic patterns.