极性成胶质细胞瘤的CT表现（附15例分析）

CT Findings of Polar Spongioblastoma

目的：极性成胶质细胞瘤少见，术前定性诊断困难，报道１５例旨在提高对该病的认识。材料与方法：回顾性分析１５例经手术病理证实的极性成胶质细胞瘤的ＣＴ表现。结果：幕上１２例，幕下３例；平扫１５例中１４例表现为低密度区或多房状低密度区，边界不清，有明显灶周水肿及占位效应；１例呈边界清楚的囊状低密度区。增强后有不同程度强化，其中环状强化６例，环壁厚薄不均，形态不规则；结节状强化４例，表现圆形或类圆形结节，密度均匀或不均匀；混合型强化４例。结论：极性成胶质细胞瘤ＣＴ表现多样，术前定性诊断困难，须与血管母细胞瘤、脑脓肿、髓母细胞瘤和室管膜瘤、星形细胞瘤鉴别。

Polar spongioblastoma is uncommon and the diagnosis before operation is difficult.15 cases of this tumor were reported for discussion.Materials and Methods:CT findings of 15 cases of polar spongioblastoma proved by surgery and pathology were analysed retrospectively.Results:This series included supratentorial polar spongioblastoma 12 cases and subtentorial 3 cases.With plain scanning,the CT findings of 14 cases were:low-density lesions or multilocular low-density lesions with indistinct margin and obvious peritumorous edema and mass effect,another case was a cystic low-density lesion with distinct margin.Post-contrast enhancement study showed that all lesions had enhancement in different degrees,including ringlike enhancement with unequal ring-wall thickness in 6 cases and irregular margin,nodular enhancement in 4 cases,circular or elliptic nodules with homogeneous or non-homogeneous density,mixed enhancement in 4 cases.conclusion:The CT findings of polar spongioblastoma were variable,accurate diagnosis before operation is difficult.Polar spongioblastoma should be differentiated from brain abscess,astrocytoma,ependymoma and hemangioblastoma.