A patient with complaints of difficult passage of solid food through the oesophagus, putrid breath, general weakness, a CT scan of the oesophagus revealed signs of a fistulous passage in the lower third of the oesophagus with a cavity in 9-10 segments of the right lung, with fluid resembling an abscess with perifocal infiltrative changes in lung tissue. Esophagogastroduodenoscopy revealed a diverticulum in the lower third of the esophagus with two fistulous passages into the pleural cavity. The patient underwent right thoracotomy to empty the abscess cavity, excision of the fibrous capsule of the abscess wall, excision of the diverticula and restoration of the esophageal wall integrity. A complication of oesophageal diverticula in the form of a fistula with formation of an abscess in the pleural cavity is a casuistic case. The main treatment for this complication is surgery.