Multiple synchronous granular cell tumours of the esophagus: a case report.

Granular cell tumours (GCTs) are relatively uncommon, usually benign and solitary neoplasms. Approximately 5-11% of all tumours occur in the gastrointestinal tract and about one third of them appear in the esophagus. Till now, only 30 cases of multiple esophageal GCTs have been reported in the literature. We present the case of a 44-year-old man with three synchronous GCTs in the distal esophagus. The lesions were detected incidentally during esophagoscopy. Histopathologic examination of tissue samples revealed the nests of polygonal cells with small hyperchromatic nuclei and abundant granular cytoplasm located in the lamina propria of the mucosa. The cytoplasmic granules were positively stained with PAS and were diastase resistant. The positive immunostaining for S-100 protein was also noted.