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Saturday, August 14, 2010


EG
- is a non-neoplastic proliferation of histiocytes and is also known as Langerhans cell histiocytosis.
-It should be included in the differential diagnosis of any sclerotic or osteolytic lesion, either well-defined or ill-defined, in patients under the age of 30.
-The diagnosis EG can be excluded in age > 30.
-EG is usually monostotic, but can be polyostotic.
- left
Osteolytic lesion arising from the neurocranium with associated soft tissue swelling.
middle
Mixed lytic-sclerotic lesion, not well-defined with solid periosteal reaction.
right
Sharply defined osteolytic lesion of the skull. There is no 'button sequestrum', which is more or less pathognomonic.Discriminator: Must be under age 30.

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