[Bilio-digestive fistula with an unusual etiology]. / Une fistule bilio-digestive d'étiologie inhabituelle.

On the basis of one case, the authors give the highlights on the various clinicopathological features of malignant gastric perforations. While medical imaging does not seem to contribute much in the positive diagnosis of such complications, it does remain essential to establish the local extension of the tumour process and thus to allow a better therapeutic management.

[Primary sarcoma of the pulmonary artery]. / Sarcome primitif de l'artère pulmonaire.

On the basis of one personal case of leiomyosarcoma, the various anatomicoclinical features of sarcomas of the pulmonary artery are summed up. They most often produce a picture of severe pulmonary embolism that is resistant to all treatments; the lesion most often is a hilar mass without any associated bronchoscopic abnormality. Angiograms are not always easily interpreted, and the modern imaging techniques (ultrasound, computed tomography, and above all MRI) can best lead to the preoperative diagnosis, although this lesion is unfrequent.

[Primary malignant fibrous histiocytoma of the lung]. / Histiocytome fibreux malin primitif du poumon.

On the basis of one personal case, the various clinicopathological features of primary malignant fibrous histiocytoma of the lung are summed up. This tumor, which has a nonspecific radiological appearance, most often appears as a large peripheral pulmonary opacity, for which the prognosis is guarded and the positive diagnosis based on surgical exeresis or biopsy.

[A radiologic image to be recognized in patients with thoracic injury: the retroligamentary pneumatocele]. / Une image à connaître chez un traumatisé thoracique: la pneumatocèle rétroligamentaire.

A 17-year-old female patient had a road traffic accident. She suffered from a minor head injury, and a right pneumothorax which had to be drained. However, when admitted, an unusual picture was found on the chest film. It was a left para-mediastinal shadow with a fluid level, its greater axis being vertical. She underwent a computerised tomographic chest scan. This picture was seen to be in the left costo-vertebral gutter, and in contact with an area of pulmonary contusion in the left posterior basal segment. Another smaller similar picture was discovered on the right side. These were interpreted as being infrapleural pneumatoceles on the mediastinal surface of the lower pulmonary lobes. The patient recovered spontaneously. In fact, these effusions of air and blood can be seen in other areas in the chest (mediastinum, pleura, lung); these are discussed.