Characterization of a human monocyte antigen, B148.4, regulated during cell differentiation and activation.

We analyzed the phenotypic changes associated with monocyte activation and differentiation using a newly developed monoclonal antibody (B148.4). Among peripheral blood leukocytes, the antigen recognized by this antibody is expressed on monocytes and granulocytes at high and low density, respectively.

[Bacillary peliosis in AIDS. Anatomo-clinical study of 2 cases].

The authors report two cases of peliosis hepatis, occurring in patients with AIDS, who presented a persistent fever and an hepatomegaly. The liver biopsies showed areas of peliosis, where bacilli were observed by Warthin-Starry stain. In one case, techniques of molecular biology allowed the identification of Rochalimaea henselae, pathogen involved in bacillary angiomatosis.

[Nephroblastomatosis and Wilms' tumor. Apropos of a case].

This case report illustrates the different anatomopathologic patterns and evolutive potentials of perilobar nephroblastomatosis described by Beckwith. The latter differs from those of an intralobar nephroblastomatosis. The evolutive possibilities of nephroblastomatosis underline the importance of imaging technology in the diagnosis and control of such lesions, as well as the role of chemotherapy and above all the caution required in the indications for surgery.

[Inflammatory pseudo-tumors of the liver. Apropos of 2 cases].

Inflammatory pseudotumors of the liver (IPTL) are a reaction pathology of most often mysterious etiology. This is an ill-known clinicopathological entity, of which 13 cases only have been reported. The authors report about 2 cases for which an infectious or parasitic etiology can be suggested.

[Borderline lesions of the breast: clinical and radiological study of 20 cases].

We describe the clinical and mammographic signs observed in 20 patients with atypical hyperplasia of the breast. The clinical signs include abnormalities noted at palpation (tumefaction, masses, clusters of nodules) and nipple discharge. The mammographic signs include rounded, clearly delineated opacities with benign appearances, or spiculated masses possibly associated with microcalcifications, stellate opacities, and isolated foci of microcalcifications.