Fig. 16

Lymphoma. Axial CT images through the lumbar spine (a) and sacrum (b) demonstrate abnormal soft tissue within the spinal canal (black arrows). Additionally, there is soft tissue replacement of the normal fat in the right sacral foramen (orange arrow). T2-weighted MR image (c) of the lumbosacral spine demonstrates an intermediate to low signal lesion involving the posterior aspect of L5, and another component at S1-S2 (orange arrows). There is no involvement of the intervertebral discs. Post-contrast T1-weighted fat-suppressed image (d) demonstrates relatively homogeneous enhancement