FIG 2. T1-weighted images and MIONs.

A, Sixteen hours after the IV administration of MIONs, T1-weighted images (500/20/4) do not show intraparenchymal hyperintensities.

B, Superficial cortical electrocoagulation was performed. Thirty minutes later, the T1-weighted images (500/20/4) do not show any intraparenchymal hyperintensities that could be confused with residual tumor. Note the hypointensity representing the electrocoagulation (arrowhead).