Young Male. Proptosis.
Iso-hyperintense orbital mass, with extra and intra conal components
* Commonest orbital tumor
* Association with Chlamydia psittaci infection has been decribed with MALT Lymphomas
* Primary orbital lymphoma (by definition) is Stage 1E disease
* MRI is best with hypointense signals on T1 (iso to hypo to muscle), and iso-hyperintense signals on T2, restricted diffusion on DWI and homogenous enhancement
* Extraocular muscles are usually not affected, and though engulfed may not be involved (as seen in case above)