Toddler with left orbital swelling

CT and MRI of Langerhans cell histiocytosis of the orbit
Coronal CT with contrast of the orbits in bone (above left) and soft tissue (above right) windows show bony destruction in the superolateral aspect of the orbit caused by a soft tissue mass. Coronal T1 MRI without (below left) and with contrast (below right) of the orbits better show the soft tissue mass superolateral to the left orbit which enhances avidly.

The diagnosis was Langerhans cell histiocytosis of the orbit.