FIG 1. A, Posterior view at 24 hours from a ¹¹¹In-labeled leucocyte examination shows a linear midline area of increased uptake (arrow).

B, Coronal contrast-enhanced T1-weighted (500/9/2) SE MR image shows dural thickening and enhancement in the falx (short wide arrow), tentorium cerebelli (curved arrows), and overlying the brain convexity (long thin arrow). Note how the leucocyte examination underestimates the extent of dural involvement.

C, Posterior view at 24 hours from a ¹¹¹In-labeled leucocyte examination shows normal intracranial appearance after treatment with anti-CD52.