Lymphomas and leukemias account for a large portion of orbital tumors. Orbi
tal lymphoma accounts for 55% of malignant orbital tumors in adults. Idiopa
thic orbital inflammatory pseudotumors are pathologic entities that often c
hallenge ophthalmologists and radiologists. This article describes the MR a
nd CT features of orbital lymphoma, leukemia, and some other lymphoprolifer
ative disorders.