ON THE COVER

The 2 MR images show no cerebral infarction. The 2 SPECT images, obtained with the patient at rest (left) and after injection of acetazolamide (right), show a mild reduction of cerebral blood flow and normal reactivity to acetazolamide in the left cerebral hemisphere. From left to right, the 5 PET images show a mild reduction of cerebral blood flow, a mild reduction of the cerebral metabolic rate for oxygen, no abnormality of cerebral blood volume, no abnormality of oxygen extraction fraction, and a mild reduction of binding potential for ¹¹C-flumazenil in the left cerebral hemisphere.