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Representative volumetric modulated arc therapy plan delivering a total dose of 6 Gy to a subdural collection along the left cerebral convexity. Axial (left), sagittal (middle), and coronal (right) computed tomography slices show the isodose distributions: 100% (6.0 Gy), 90% (5.4 Gy), 50% (3.0 Gy), and 16.67% (1.0 Gy). The prescription dose region conforms tightly to the crescentic target, with steep dose fall-off sparing the underlying brain parenchyma.
