The most common radiographic sign for secondary osteomyelitis of the paranasal sinuses is:

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Erosion of the bony margins is the most common radiographic sign for secondary osteomyelitis of the paranasal sinuses. This can be seen on X-ray or CT scans as loss of bony definition or destruction of the bony margins. Other signs such as mucosal thickening, polyps, or deviation of the bony nasal septum may also be present but are less specific for osteomyelitis.

The Most Common Radiographic Sign for Secondary Osteomyelitis of the Paranasal