目的探讨透明隔区肿瘤与肿瘤样病变的影像学特点。资料与方法分析经手术病理证实的19例透明隔肿瘤与肿瘤样病变的影像表现。男7例,女12例。原发性16例,继发性3例。术前仅行MRI检查者11例,CT检查3例,既行CT检查又行MRI检查者5例。结果 (1)16例原发性肿瘤或肿瘤样病变完全依附于透明隔,其中14例突向一侧脑室生长。3例继发肿瘤大部附着于透明隔,其余位于胼胝体、尾状核或丘脑;(2)透明隔肿瘤及肿瘤样病变一般以混杂信号为主(13例),T1WI、T2WI呈混杂信号,中枢神经细胞瘤(CNC)(4例)、少突胶质细胞瘤(OLG)(1例)及淋巴瘤(1例)在扩散加权成像(DWI)序列上呈高信号,增强后病变轻度强化1例,中度强化6例,明显强化6例。(3)原发性透明隔肿瘤以囊实性为主,CNC、室管膜下巨细胞星形细胞瘤(SGCA)、室管膜下瘤及生殖细胞瘤一般呈小囊,星形细胞瘤、室管膜瘤及OLG呈大囊;继发性肿瘤中淋巴瘤(2例)一般为实性,星形细胞瘤(1例)呈大囊型。(4)其他表现有钙化(5例)、出血(2例)及灶周水肿(3例)。结论根据病变与透明隔的位置关系可推断其来源,肿瘤或肿瘤样病变的信号/密度、囊变大小、钙化及瘤周水肿等影像表现有助于定性诊断。 Objective To investigate the imaging features of tumor and tumor-like lesions in clear septum. Materials and Methods Nineteen cases of clear septal and tumor-like lesions confirmed by surgery and pathology were analyzed. 7 males and 12 females. 16 cases of primary, secondary in 3 cases. Only preoperative MRI examination in 11 cases, CT examination in 3 cases, both CT and MRI examination in 5 cases. Results (1) 16 cases of primary tumor or tumor-like lesions completely attached to the transparent septum, of which 14 cases of sudden lateral ventricle growth. 3 cases of secondary tumor mostly attached to the clear septum, the rest located in the corpus callosum, caudate nucleus or the thalamus; (2) clear septal and tumor-like lesions are generally mixed signals (13 cases), T1WI, T2WI were mixed signal, Central nervous cell tumor (CNC) (4 cases), oligodendroglioma (1 case) and lymphoma (1 case) showed high signal intensity on diffusion weighted imaging (DWI) 1 case of enhancement, 6 cases of moderate enhancement and 6 cases obviously enhancement. (3) The majority of primary clear septa tumors were cystic. CNC, subependymal giant cell astrocytoma (SGCA), subependymoma and germ cell tumor were generally cystic, astrocytoma , Ependymoma and OLG were large capsule; secondary tumor in lymphoma (2 cases) is generally solid, astrocytoma (1 case) were large capsule type. (4) Other manifestations were calcification (5 cases), hemorrhage (2 cases) and perifocal edema (3 cases). Conclusion According to the relationship between the location of lesions and the transparent septum, the source, tumor or tumor-like lesions of signal / density, cystic degeneration, calcification and peritumorous edema and other imaging findings contribute to the qualitative diagnosis.