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Chloroma

Case contributed by Frank Gaillard
Diagnosis almost certain

CT Brain

ct

Occipital bone soft tissue mass, clearly extradural, destroying the bone. 

MRI Brain

mri

A soft tissue mass which is of low T2 signal and demonstrates vivid contrast enhancement is located within the occipital bone. It displaces the torcual anteriorly without invasion or occlusion. 

Case Discussion

The patient went on to have a resection which histologically confirmed chloroma (also known as a granulocytic sarcoma or myeloid sarcoma) of the occipital bone.

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