Granular Cell Tumor - An Important Entity to Consider on Upper Gastrointestinal Endoscopy.

Granular cell tumors (GCT) are benign, submucosal tumors derived from neural or Schwann cells. They are commonly found in the oral cavity, skin, breast and tongue. Less commonly, they can also occur in the gastrointestinal tract, usually in the esophagus. We describe two cases of esophageal GCT which were discovered by upper endoscopy (EGD). Case one underwent endoscopic ultrasound (EUS) guided fine needle aspiration and biopsy and case two underwent biopsy of a submucosal nodule. Both biopsies were histologically diagnosed as GCT with supportive S100 positive immunostaining. GCTs are an important diagnosis for physicians to consider in their differential of esophageal nodule or lesion. Though benign, they may rarely show malignant transformation. Therefore, it is essential to have surveillance with EGD/EUS every two to three years if they are not surgically resected.