Malignant gastrointestinal stromal tumour in the posterior mediastinum.

Gastrointestinal stromal tumours (GISTs) are the most common mesenchymal tumours of the gastrointestinal tract. GISTs are predominant in the stomach and intestine, and rarely occur in the oesophagus. A GIST in the posterior mediastinum usually arises from the oesophagus, but single case of gastric GIST in the posterior mediastinum is reported. We present a case of a posterior mediastinal malignant GIST which was likely of gastric origin. The patient had no recurrence for 5 years after a complete resection.