Résumé
The hypopharyngeal Zenker's diverticulum is a rare pathology [1%of oesophagien pathology]. It is up to a hernia of the oesophagus posterior wall throught the fibres of the pharynx inferior constrictor muscle. Many pathogenic hypotheses are put forword; it is generally benign but can cause serious complications. The treatment can be difficult. The best treatment seems to be diverticulectomy with cricopharyngeal myotomy. Endoscopic treatment can be a good therapeutic alternative. We report four cases of patients with DPO three women and one man; the mean age of patients was 67 years. All our patients suffered from dysphagia and loss of weight. The diagnostic, clinically suspected was cofirmed by radiological examinations. All our patients were operated. Surgery was satisfactory for three patients. One patient died