A 58-year-old previously meticulous bank manager presents with 18 months of progressive personality change, behavioral disinhibition (inappropriate sexual comments, shoplifting), apathy, loss of empathy, and compulsive eating leading to 12 kg weight gain. Memory and visuospatial skills remain relatively preserved (MMSE 26/30). Examination reveals utilization behavior and palmomental reflex. T1-weighted MRI shows the pattern marked **B** in the diagram: striking asymmetric atrophy of the frontal lobes (right > left) and anterior temporal lobes (right > left), with widened sulci and narrowed 'knife-blade' gyri. The hippocampi are relatively preserved. Which of the following is the most likely diagnosis and best reflects the clinical-radiologic correlation of the structure marked **B**?
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