FIG 3. TDL in a 37-year-old man.

A, T2-weighted image (3400/119/1) shows a large hyperintense mass lesion in the right parietal lobe. There are no visible flow voids within the lesion.

B, Unenhanced T1-weighted image (600/14/1) shows hypointense signal of the lesion.

C, Contrast-enhanced T1-weighted image (600/14/1) shows heterogeneous enhancement of the medial aspect of the lesion in a concentric pattern.

D, Dynamic T2*-weighted image (1000/54/1) obtained before IV administration of contrast agent.

E, Dynamic T2*-weighted image (1000/54/1) obtained during IV administration of contrast agent shows several periventricular, linear vessel-like structures (arrows) running through the center of the lesion near a dilated subependymal vein. The dominant lesion itself shows no signal loss.

F, Dynamic T2*-weighted image (1000/54/1) obtained 50 s after IV administration of contrast agent shows return of brain signal to baseline, with residual signal loss within the aforementioned linear vessel-like structures.