[Morphofunctional characteristics of the endosteum in connection with bone remodeling]. / Morfofunktsional'naia kharakteristika éndosta v sviazi s problemoi remodelirovaniia kosti.

Current information on the endost structure at different stages of bone remodelling is given on the basis of the original data and literature. Possible causes and character of the bone cells activity changes during the cycle of remodelling at the decreased functional stimulation on the bone structures and under pathological conditions are discussed.

Intrathoracic lymphoproliferative disorders and lymphoma.

The spectrum of lymphoproliferative disorders is truly a continuum from benign diseases to malignant aggressive lymphomas. Remarkable advances in laboratory techniques of monoclonal antibody production and molecular biology over the last decade allow more sophisticated analysis of these diseases. It is now apparent that some entities previously labeled "benign" are actually non-Hodgkin's lymphomas. We review the current knowledge of this spectrum including the histopathologic and clinical findings, as well as the radiographic characteristics. Understanding the diseases, treatment challenges, and follow-up requirements aids the radiologist in a more efficient and cost-effective evaluation of these patients.

Lymphoproliferative disorders of the lung: histopathology, clinical manifestations, and imaging features.

The lymphoproliferative disorders represent a spectrum of lymphoid abnormalities that can involve the chest. Plasma cell granuloma, pseudolymphoma, posttransplantation lymphoproliferative disorders, lymphoid interstitial pneumonia, and lymphomatoid granulomatosis involve the pulmonary parenchyma, whereas Castleman's disease, infectious mononucleosis, and angioimmunoblastic lymphadenopathy with dysproteinemia involve intrathoracic lymph nodes. Recent immunohistochemical techniques give us a better understanding of the lymphoproliferative disorders. Clinical and radiologic features often allow differentiation of the lymphoproliferative disorders from the more common aggressive lymphomas.

Clear cell adenocarcinoma of the urinary bladder: report of a case of probable müllerian origin.

A 35-yr-old woman with a history of endometriosis and several recent episodes of hematuria was found to have an exophytic tumor arising from the mucosa of the posterior bladder wall. Microscopic examination showed a typical clear cell adenocarcinoma with a predominant tubulo-cystic pattern. A radical cystectomy was performed. Pathologic examination showed no residual tumor, but grossly visible intramural cysts at the site of the tumor had features of endometriosis on microscopic examination, strongly suggesting that the clear cell adenocarcinoma arose from endometriosis and was of müllerian derivation. Only one other adenocarcinoma of the bladder, an endometrioid adenocarcinoma, has had a probable müllerian origin. Although rare, these cases indicate that some vesical adenocarcinomas are of müllerian type.