[en] MR imaging of the chest was performed in nine patients who underwent pneumonectomy and had no sign of cancer recurrence, in order to evaluate postoperative chest anatomic modifications by this method. All the MR studies were compared with chest CT. Postpneumonectomy space revealed in all cases a heterogeneous signal both on T1 and T2-weighted spin-echo sequences. Vascular and bronchial stumps were clearly delineated with the two methods. MR imaging depicted low-signal areas around these stumps, considered postoperative scars, while they were misdiagnosed with CT. Spatial involvement was better understood with MR imaging. Surgical clips and calcifications were indistinguishable. No adverse effect was reported in patients with or without surgical clips

[en] Erdheim-Chester disease is a rare non-Langerhans form of histiocytosis characterized by a distinct histologic pattern of histiocytes and typical radiographic features. We report a case of Erdheim-Chester disease with no radiographic abnormalities but with extensive bone involvement of appendicular skeleton on bone scan and magnetic resonance imaging. This case emphasize the role of bone scanning in suspected Erdheim-Chester disease. The clinical presentation, bone scan findings and the immuno-histologic (CD68 +, S100 +, CD1a) phenotype of our patient were discussed. (authors)

No abstract available

[en] This paper reports two giant-cell tumours of bone of low-grade malignancy, both complicated by the development of pulmonary metastases in which the histological appearances were identical to those of the primary neoplasm. Ten similar cases in the literature are reviewed. (orig.)

[en] Six sacrococcygeal chordomas were studied with CT at the Institut Gustave-Roussy. Only one was examined at the time of the initial diagnosis and CT made a valuable contribution to this. In other cases, CT determined the possibility of initial surgical excision and the field of radiotherapy and helped make a reliable diagnosis of local recurrences. CT seems to be the best examination to use for the early diagnosis of chordomas and recurrences, which will perhaps help improve the prognosis of this serious disease. (orig.)

[en] Compared with malignant neoplasms of the chest, benign tumours are quite rare; cylindroma (or salivary gland adenoma) is exceptional. The apparent histological benignancy belies its high potential for invasiveness. This can, in some cases, lead to extensive, non-conservative surgery. By a different approach in the imaging of the chest, magnetic resonance imaging in this condition may provide an accurate pre-operative assessment. We present a case in which MRI provided the information necessary for the surgical approach, and describe its accuracy and the results obtained. (orig.)

[en] Malignant non-Hodgkin lymphomas are a neoplastic proliferation of lymphoid cells whose clinical manifestations are extremely variable. All tissues can be affected. There may be localization in lymphoid organs (Waldeyer's ring, spleen, digestive tract), other localizations (lungs, pleura, liver, bone marrow, central nervous system) and unusual localizations. Although bone marrow is often affected, bone involvement is very rare in the early stages of the disease. This report concerns the radiological study of two disseminated malignant non-Hodgkin lymphomas affecting only the bone in children. (orig.)

[en] Malignant fibrohistiocytoma (MFH) is one of the most frequent malignant tumours of soft tissues. Its classification as a bone tumour, however, is relatively recent. In addition to primary MFH in bone, the entity has been observed to occur as a secondary phenomenon, some cases having complicated pre-existing infarcts of bone. This paper reports three cases of MFH of bone developing as a consequence of previous radiation therapy. (orig.)

[en] Three articles have for purpose the radiation doses optimization in medical imaging. The first one concerns the radiation protection of manipulators working at a PET scan post, the second one concerns more particularly the optimization of doses delivered in pediatric computerized tomography, the third one is devoted to a comparison between radiation dose and image quality through scanners of adult temporal bone. (N.C.)