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Biomedical subjects

R S Neiman

Publications and source records attributed to R S Neiman.

102 records · Page 6Linked to original sources
PubMed1977

"Lennert's lymphoma" with transformation to malignant lymphoma, histiocytic type (immunoblastic sarcoma).

Two cases of a recently described lymphoproliferative disorder called "Lennert's lymphoma" are presented. In both cases, the proliferation evolved into a frank malignant lymphoma of large lymphoid cells. This phenomenon has not been previously reported to occur in this disease. Immunohistologic study of the biopsy material in both cases suggest that it may be a T-cell proliferation. The possibility that "Lennert's lymphoma" is not a neoplasm but an abnormal immune reaction with similarities to angioimmunoblastic lymphadenopathy is raised. Whatever its nature, the potential for "Lennert's lymphoma" to transform into a frankly malignant tumor is documented.

Aged↗
PubMed1977

Incidence and importance of splenic sarcoid-like granulomas.

In an attempt to further define the nature, occurrence, and relative incidence of splenic sarcoid-like granulomas, 412 splenectomy specimens were studied. In addition to their occurrence in sarcoidosis, granulomas were found in patients with Hodgkin's disease, chronic uremia, non-Hodgkin's lymphoma, and selective IgA deficiency. The inability to demonstrate a specific responsible organism suggests that the lesion is not of infectious cause. The location of the lesions in the areas of antigen-trapping in the spleen, and their occurrence in both neoplastic and nonneoplastic diseases associated with abnormal or defective immunity suggests that they represent morphologic evidence of a nonspecific defect in antigen processing.

Dysgammaglobulinemia↗
PubMed1976

Gelatinous transformation of bone marrow in prolonged self-induced starvation.

In bone marrow from 3 patients with prolonged, severe self-induced starvation, fat atrophy, hypoplasia of haemopoietic cells and characteristic gelatinous transformation of marrow were noted. The gelatinous substance appeared amorphous and stained pink with the Wright-Giemsa stains. Histochemical and ultrasturctural studies indicated that it consisted of acid mucopolysaccharides and was extracellular in nature. Similar marrow abnormalities were produced in rabbits by limitating their food intake for 4 months. These marrow abnormalities in the experimental animals could be reverted to normal by restoring their nutritional status. It is proposed that the gelatinous transformation of marrow is caused by excessive production of mucopolysacchrides of the ground substance to compensate for the mobilization of marrow fat which occurs to meet the energy requirement. It is further postulated that excessive production of acid mucopolysaccharides may provide a microenvironment unsuitable for haemopoietic proliferation. The relevance of these findings to other conditions associated with marrow aplasia, is discussed.

Animals↗