Transdiaphragmatic cyst-jejunostomy with Roux-en-Y loop for an exclusively mediastinal pancreatic pseudocyst.

In a patient presenting with a roentgenographic retrocardiac density, left pleural effusion and distal oesophageal displacement, echocardiography confirmed presence of a pseudocyst in the posterior mediastinum. Pancreatic origin was suspected. Left thoracolaparotomy revealed the large (900 ml), exclusively mediastinal pseudocyst, surrounding the aorta and adherent to the diaphragm, with high amylase content. Decompression was achieved with a retrocolic and gastric Roux-en-Y loop by transdiaphragmatic cystojejunostomy.