Fig 3.

MR images obtained <48 hours after surgery.

A, Axial nonenhanced T1-weighted image (500/12/1) shows the hypointense balloon and central shaft (tube), with good visualization of surrounding tissues.

B, Axial contrast-enhanced T1-weighted image (500/12/1) shows the well-defined borders of the device and surroundingtissue, associated with thin enhancement of the surgical bed.

C, Corresponding axial T2-weighted image (5050/99/1) shows the hyperintense balloon. There is a small amount of ill-defined hyperintensity in adjacent tissues.

D, Corresponding axial FLAIR image (8000/110/1) shows the hyperintensity in the tissues around the balloon better. These areas are most likely residual vasogenic tumor edema and postsurgical changes.