General autopsy findings included a venous thrombosis involving the right kidney, and bilateral acute pneumonitis (with no organisms seen on special stains for bacteria or fungi). The brain was removed and fixed for two weeks in 10% buffered formalin. External examination showed only small subarachnoid hemorrhages. Coronal sections revealed massive bilateral internal lesions. The periventricular white matter was completely necrotic and liquefied, and drained out of the specimen at brain cutting. Subcortical white matter and the corpus callosum remained intact.