Fig 3. MR images of a 1.3-year-old boy with AT/RT in the right cerebral peduncle.

A, Axial (TR/TE, 600/10) MR image shows the tumor to have intermediate signal intensity.

B, Axial (TR/TE, 4000/105) MR image shows the tumor to have heterogeneous intermediate-to-slightly-high signal intensity, which includes zones that are isointense or slightly hyperintense to gray matter.

C, Axial (TR/TE, 700/22) fat-suppressed MR image shows prominent homogeneous contrast enhancement of the primary lesion as well as abnormal subarachnoid enhancement in the interpeduncular cistern and along the sulci adjacent to frontal lobes (arrows), representing disseminated leptomeningeal tumor. This patient died 4 months after diagnosis.