Tumors of children and young adults, lymphangiomas often have poorly defined margins, and they show little or no contrast enhancement. Although benign, they are infiltrative lesions and often involve both the anterior and posterior compartments of the orbit. The cystic components are often characteristic on MR, with multiple fluid levels of varying signal intensity. Endnote Since lymphangiomas are characterized by slow, but relentless growth, expansion of the bony orbit can occur. Acute proptosis may develop secondary to an upper respiratory tract infection or from intratumoral hemorrhage. Endnote  

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