Fig. 2.

Pre- and post-operative neuroradiological findings of Case 1. (A, B) DWI of the MRI, performed 2 days after onset, showing slight progression of the right cerebral infarction. (C) MRA illustrating a faint flow signal in the right ICA, but no remarkable change compared to MRA on admission. (D, E) The DWI of the MRI, performed 6 days after onset, revealing further progression of the right cerebral infarction. (F) MRA illustrating deterioration of the faint flow signal in the right ICA. (G, H) MRA and DWI, performed 1 day after bypass surgery, revealing a patent bypass (white arrow in G) but further progression of right cerebral infarction in the territory of the MCA posterior trunk (I) ¹²³I-IMP SPECT, performed 1 day after surgery, demonstrating reduction of cerebral blood flow in the territory of the right MCA posterior trunk (white arrow in I) and hyperperfusion in the territory of the MCA anterior trunk (white arrow head in I). (J) MRA, performed 3 weeks after bypass surgery, showing bypass patency. (K, L) DWI and Fluid-attenuated inversion recovery (FLAIR)of MRI, performed 3 weeks after bypass surgery, revealing only natural time-course changes in the right cerebral infarction in the territory of the MCA posterior trunk.