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CT Head Osteoma

There is normal density, size and configuration throughout the brain parenchyma and the CSF containing spaces.
There is no hemorrhage, edema, mass effect, hydrocephalus, herniation, or pathologic fluid collection.
In the left frontal sinus there is a new well-defined, calcified mass with a groundglass appearance. The margins of the left frontal sinus demonstrate increased sclerosis.
Otherwise, the demonstrated calvarial bones are normal.

1. No acute intracranial hemorrhage or mass effect.
2. Benign-appearing left frontal sinus bone forming tumor. This most likely represents a sinonasal osteoma. Differential would include sinonasal fibrous dysplasia. High HU argues against fungus.