Abstract
OBJECTIVES—The clinical neuropsychological, neuroradiological, and neuropathological description of two patients presenting with a frontal gait disturbance. METHODS—Clinical case note review, neuropsychological assessment, functional imaging with 15O2 and 18F-fluorodopa PET, and neuropathology. RESULTS—Both patients presented with frontal gait impairment and only later developed more widespread cognitive impairment. In both cases 15O2 PET disclosed focal hypometabolism in the medial frontal lobes and in one patient 18F-fluorodopa uptake into the caudate and putamen was normal. The neuropathological examination in one patient showed Alzheimer's histopathology together with large swollen eosinophilic neurons characteristic of corticobasal degeneration, which were particularly prominent in the medial frontal lobes. CONCLUSION—Focal degeneration of the medial frontal lobes may present as an isolated gait disturbance and should be considered in the differential diagnosis of patients who present without an obvious structural abnormality on neuroimaging.
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