Orbital lymphoma. a, b. Subacute onset right proptosis and upper lid mechanical ptosis with an absence of inflammatory signs. c. Coronal CT image demonstrates right lateral orbit superior and inferior infiltration by dense homogenous mass that uniformly enhances with contrast administration. Of note, the mass conforms to surrounding structures and extends along fascial planes with little surrounding inflammation. Significant disparity between tumor bulk and lack of proptosis is noted.