Malformation lymphoma

Rhabdomyosarcoma is the most common soft tissue tumor of the orbit in children under the age of 15 years. Clinically, rhabdomyosarcoma of the orbit is characterized by rapidly progressive proptosis, a decrease of ocular motility, and unilateral ptosis. Cross-sectional imaging reveals a well-delineating tumor whose density or signal intensity is similar to intra-orbital muscles on unenhanced images and increases markedly after intravenous contrast administration. The differential diagnosis includes venous lymphatic malformation, lymphoma, intra-orbital neuroblastoma, and idiopathic inflammatory disease of the orbit (Mueller-Forell and Pitz 2004). 

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