Fig 1. A, Coronal CT scan of the paranasal sinuses (bone window setting) shows the osteolipoma passing through the left ethmoidal sinus into the left nasal cavity. B and C, Coronal CT scan of the paranasal sinuses (bone window setting) (B) and sagittal reformatted image (C) show the osteolipoma based on the roof of the left frontal sinus.