“ORBITAL LYMPHATIC MALFORMATION”

Also known as lymphangioma or cystic hygroma, they are the most common vascular orbital tumour. They usually affect children aged 3-15 years and tend to bleed. Bleeds cause sudden proptosis. They are associated with chromosomal abnormalities including Turner syndrome, trisomies and Noonan syndrome.
CT

•  Multi-cystic lesion with fluid-fluid levels (from recurrent haemorrhage)
•  More commonly extra-conal
•  Phleboliths with venous malformations

MRI

•  High T1 and T2
•  Typically no enhancement



 

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