Radiological investigation is one of our most important aids in the differential diagnosis in cases of unilateral exophthalmos. Even so it is only in a limited number of cases that the ordinary radiological investigation will give diagnostic information, that is, in cases in which there is affection of the bones surrounding the orbit. If a space-taking lesion is entirely localized in the soft tissues of the orbit, as is the case with the majority of orbital tumors, ordinary radiological investigation cannot offer any help, and as a rule one does not get any further information from tomography. By using the different types of radiological investigation with contrast media, however, one can obtain information as to the presence of tumor, its size and localization.
The methods that can be used are carotid angiography, phlebography of the orbital veins, and injection of an iodine-containing contrast medium or air directly into the orbital
BERTELSEN TI. Pneumotomography of the Orbit. Arch Ophthalmol. 1962;68(4):446-452. doi:10.1001/archopht.1962.00960030450005