Biomedical subjects
Publications and source records attributed to M Greiff.
A case of an intracerebral bleeding from haemangiopericytoma is reported. To our knowledge it is the first published case. The literature concerning apoplectic presentation of brain tumours is reviewed.
Hydrogen peroxide injected into the anterior chamber of adult rabbits causes a sequence of events that is not seen in young normal rabbits, yet is replicated in young rabbits receiving a catalase inhibitor. The uptake of radiolabeled adenine was measured in corneal endothelial, ciliary epithelial, and iris cells of either normal eyes, eyes injected with hydrogen peroxide or inhibitors of glutathione metabolism. Cellular adenine uptake did not exceed that of the bathing solution, except in corneal endothelia and ciliary epithelium of young animals. Under different experimental conditions intracameral hydrogen peroxide decreased adenine uptake into cells of various tissues compared the same experimental condition where only water injections was made. This occurred even with suppression of catalase activity using 3-aminotriazole. Intravitreal glutathione inhibitors had no effect on adenine uptake. The effects of intracameral hydrogen peroxide seen previously might be explained on the basis of alterations in cellular plasma membrane permeability.
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An osteoid osteoma of the distal phalanx of the thumb in a 14-year-old girl is described. Apart from the rare site of the lesion, other unusual features included early closure of the epiphyseal plate, enlargement of the involved segment of the thumb, and hypertrophy of the nailbed. The radiographic appearance was unusual in that it simulated a soft tissue mass eroding the bone from without.