Objective To investigate the MRI imaging features of chordoid meningioma and improve the preoperative diagnostic accuracy.Methods MRI imaging findings of 7 cases of chordoid meningioma confirmed by operation and pathology were retrospectively analyzed.Results The tumors were located in the convex side of the brain,in the middle and posterior fossa of the brain in 2 cases,beside the falx of the brain,in the anterior horn of the lateral ventricle and in the sellar region in 1 case.All the 7 cases showed low signal on T1WI and high signal on T2WI,and 3 of them showed uneven signal in tumor.7 cases of equal low signal in DWI,ADC value was 0.757×10-3mm2/s～1.693×10-3mm2/s.The NADC(nomalized ADC)values in 6 cases ranged from 1.52 to 2.23,1.27 in 1 case.Uniform and significant enhancement was observed in 4 cases,uneven enhancement in 3 cases,and meningococcal tail sign in 3 cases.There were 1 case of wrapped pituitary stalk,peritumoral brain parenchyma invasion,peritumoral nerve invasion and peritumoral edema.Conclusion In addition to the basic MRI features of meningioma,chordoid meningioma also has other characteristic features,including low signal on T1WI,high signal on T2WI,unrestricted DWI,NADC greater than 1.5,and significant enhancement of tumor parenchyma on enhanced scan.
万方数据
维普
