Figure 4. Perfusion weighted imaging(PWI) and histopathological photograph from a patient with anaplastic astrocytoma (same patient as in Figure 3). (a) Relative cerebral blood volume (rCBV) colour map. (b) Signal-intensity time-curve. (c) Histopathological photograph. rCBV maps were inhomogeneous with various increases of signal intensity in solid portion of tumour. Histopathological photograph of tumour confirmed the diagnosis of anaplastic astrocytoma.