Primary hydatid cyst of the posterior mediastinum.

Hydatid cystic disease is still a health problem in Morocco. Mediastinal localization is very rare. We report the case of a 24-year-old man who presented with right chest pain and dyspnea. Chest X-Ray and computed tomography showed a mediastinal mass. The diagnosis was confirmed perioperatively by macroscopic and histologic investigations. Resection of the cyst was performed, and a small part intimately adherent to the inferior vena cava and oesophagus was left in place. There were no complications or recurrence.