A Reversible Posterior Leukoencephalopathy Syndrome
Judy Hinchey, M.D., Claudia Chaves, M.D., Barbara Appignani, M.D., Joan Breen, M.D., Linda Pao, M.D., Annabel Wang, M.D., Michael S. Pessin, M.D., Catherine Lamy, M.D., Jean-Louis Mas, M.D., and Louis R. Caplan, M.D.
Background and Methods In some patients who are hospitalizedfor acute illness, we have noted a reversible syndrome of headache,altered mental functioning, seizures, and loss of vision associatedwith findings indicating predominantly posterior leukoencephalopathyon imaging studies. To elucidate this syndrome, we searchedthe log books listing computed tomographic (CT) and magneticresonance imaging (MRI) studies performed at the New EnglandMedical Center in Boston and Hôpital Sainte Anne in Paris;we found 15 such patients who were evaluated from 1988 through1994.
Results Of the 15 patients, 7 were receiving immunosuppressivetherapy after transplantation or as treatment for aplastic anemia,1 was receiving interferon for melanoma, 3 had eclampsia, and4 had acute hypertensive encephalopathy associated with renaldisease (2 with lupus nephritis, 1 with acute glomerulonephritis,and 1 with acetaminophen-induced hepatorenal failure). Altogether,12 patients had abrupt increases in blood pressure, and 8 hadsome impairment of renal function. The clinical findings includedheadaches, vomiting, confusion, seizures, cortical blindnessand other visual abnormalities, and motor signs. CT and MRIstudies showed extensive bilateral white-matter abnormalitiessuggestive of edema in the posterior regions of the cerebralhemispheres, but the changes often involved other cerebral areas,the brain stem, or the cerebellum. The patients were treatedwith antihypertensive medications, and immunosuppressive therapywas withdrawn or the dose was reduced. In all 15 patients, theneurologic deficits resolved within two weeks.
Conclusions Reversible, predominantly posterior leukoencephalopathymay develop in patients who have renal insufficiency or hypertensionor who are immunosuppressed. The findings on neuroimaging arecharacteristic of subcortical edema without infarction.
Source Information
From the Department of Neurology, New England Medical Center and Tufts University School of Medicine, Boston (J.H., C.C., B.A., J.B., L.P., A.W., M.S.P., L.R.C.), and the Service de Neurologie, Hôpital Sainte Anne, Paris (C.L., J.-L.M.).
Address reprint requests to Dr. Caplan at the Department of Neurology, New England Medical Center, 750 Washington St., Boston, MA 02111.
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