Orbital plain films as a prerequisite for MR imaging: is a known history of injury a sufficient screening criterion?
Screening plain films of the orbit are necessary when a patient has a history of a known intraocular or periorbital foreign body or when a patient has a history of occupational exposure to potential metallic ocular injury, as do welders, grinders, and metalworkers.
Preoperative CT scans could help clinicians to identify intrathymic cyst and small thymoma, and we recommend 31.2 HU as the best thresholds. Contrast-enhanced CT scans is useful for further identification of the two diseases.