Gastric Stromal Tumor Extends into Mediastinum and Thoracic Cavity: A Case Report

The annual incidence of gastrointestinal stromal tumor (GIST) is 13.74 per million population in Taiwan. About 10-30% of GISTs have malignant behaviors including invasion and metastases. Although one case of primary esophageal stromal tumor with direct invasion into the lung parenchyma has been reported, rarely has a gastric stromal tumor been documented to extend into mediastinum and thoracic cavity. We report an extremely rare case of primary gastric stromal tumor with extension into mediastinum and thoracic cavity and suspicious invasion of lung, presenting predominantly with respiratory symptoms.