Frontal sinus osteoma
Incidental finding on a pre MRI orbit radiograph.
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Dedicated images for the orbits show a well-defined and lobulated dense lesion within the floor of the left frontal paranasal sinus. The remainder study is unremarkable.
Features are consistent with an incidental found paranasal sinus osteoma, a common benign tumour. The diagnosis was achieved only based on the imaging features, a less likely differential to include would be an osteoblastoma.