CT Diagnosis of Osteogenic Benign Tumor and Tumor Mimics in Orbit / 实用放射学杂志

ABSTRACT

Objective To analyze the CT features of orbital bone benign tumor and tumor mimics,so that to improve the diagnostic accuracy of these diseases.Methods CT appearances of orbital bone benign tumor and tumor-like lesion in 32cases proved by surgery,pathology and clinical features were reviewed.The lesions included orbital bone benign tumor(n=17)and tumor-like lesions(n=15).Results On CT,orbital osteomas in 9 cases showed homogeneous high density and cavernous bone-like density or ground glass-like density;ossifying fibroma in 5 cases were well-defined expansion of bone with ossification,cystic areas within the lesions;epidermal cyst in 2 displayed cystic density ;calcification and ossification could be seen in 1 case of chondroma ;10 cases of fibrous dysplasia showed ground glass-like density with cystic areas in poor-defined expansion of bone;the osteolytic destruction with well-defined margin were founded in 3 cases of orbital Langerhans' cell histiocytosis;1 case of aneurismal bone cyst appeared as cystic and expansive lesion with thin bone shell;1 case of osteopetrosis showed homogeneous high density in orbital wall.Conclusion Various orbital bone benign tumor and tumor-like lesions have different CT features.CT scan can clearly demonstrate the extent,density,border and the relationship with adjacent tissue of these lesions.