[Refractory hypoxemia caused by transient opening of the foramen ovale after pneumonectomy].

A patient with bronchogenic cancer underwent right pneumonectomy. Surgical and infectious criteria were normal during the postoperative period when immediate postoperative severe hypoxeamia occurred. Pure oxygen only incompletely corrected the situation.

[Benign mediastinal hemangiomas].

Haemangiomas represent a very rare form of primary mediastinal tumour. Their benign character, though rare, should not allow one to forget that their excision is correct, though sometimes tricky on account of their special anatomic situation. Two new observations are reported here as evidence of this difficulty.

[Isolated cystic lymphangioma in the mediastinum].

Cystic lymphangioma localized only in the mediastinum is a rare type of primitive tumour (less than 1% of the mediastinum primitive tumours). These three new observations concern lymphangiomas with an anterior position ; therir anatomical connections with the lymphatic system are difficult to show. Treated by surgery these benign tumours have a good prognosis and only a few cases of local recurrences have been reported.