眶骨良性肿瘤与瘤样病变的CT诊断

目的分析眶骨良性肿瘤与瘤样病变的CT表现,提高对此类病变的认识。方法回顾32例经手术、病理和临床证实的眶骨良性肿瘤与瘤样病变,包括良性肿瘤17例、瘤样病变15例。结果骨瘤9例,呈均一致密影、海绵骨样密度或磨砂玻璃样改变;骨化性纤维瘤5例,表现为边界清晰的膨胀性骨性肿块,内有骨化、囊变等;2例表皮样囊肿呈囊性密度;1例软骨瘤以钙化、骨化为主;骨纤维异常增殖症10例,受累骨不规则膨大,磨砂玻璃样密度伴囊变,边界不清;郎格罕氏细胞组织细胞增生症3例,不规则骨质破坏,边缘清晰;1例动脉瘤样骨囊肿表现为膨胀性肿块,有薄骨壳;1例石骨症眶骨增厚,呈均一致密影。结论眶骨良性肿瘤与瘤样病变的CT表现各具特征性,CT扫描能清晰显示病变范围、密度、边界以及与邻近结构的关系。

CT Diagnosis of Osteogenic Benign Tumor and Tumor Mimics in Orbit

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.