Özet:

Abstract: This study include spatients with the pre-diagnosis of orbital space-occupying tumor or tumor-like lesions examined on CT in Ankara Training and Research Hospital Radiology Department. Thyroid ophthalmopathy cases were not included in the study. CT criteria specific to orbital mass lesions and the diagnostic value of CT were investigated through comparison of the CT findings with the histopathological results. Of a total of 40 patients, 22 (55 %) were diagnosed with primary tumors, 6 (12.5 %) with secondary tumors and 12 (32.5 %) with tumor-like lesions.  CT is highly sensitive in the definition of intra-tumoral calcifications, and sclerotic and destructive changes in osseous structures. The location and local invasion of intraorbital space-occupying lesions can be clearly differentiated on CT. Diagnosis of intraocular lesions can be made specifically, correlating CT findings with orbital ultrasound results. The differential diagnosis of benign and malignant tumoral lesions from inflammatory and vascular lesions can be made using CT. In some cases where no specific diagnosis can be made, CT directs the therapy by identifying the outlines and morphological characteristics of the lesion. The diagnostic specificity of CT will surely increase in the light of anamnesis, physical examination findings and other radiological modalities.

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