Pre and post contrast CT images demonstrate two dominant hyperdense and enhancing lesions; one in the rostral midbrain and the other involving the splenium of the corpus callosum. The former is homogeneous in density and surrounded by moderate surrounding vasogenic oedema. The latter demonstrates haemorrhage.
Distribution and appearance of the non-haemorrhagic lesion strongly favours CNS lymphoma. Haemorrhage in PCNSL is very uncommon, seen more frequently in immunocompromised individuals.