A new case of spontaneous cervico-mediastinal hematoma due to parathyr
oid adenoma is reported. It is a rare complication of parathyroid aden
oma. When mediastinal compression with respiratory distress occurs, en
dotracheal intubation excludes an intrathoracic vascular injury. Labor
atory tests reveal a hyperparathyroid syndrome which may disappear aft
er the acute hemorrhage. Whatever is the outcome of the hyperparathyro
id syndrome, surgical treatment is required. As far as possible, it sh
ould be performed after the acute hemorrhage.