MRI diagnosis of intracranial hemangiopericytoma

WA NG Zu-fei; JI Jian-song; YA NG Hong-yuan; LU Chen-ying

Abstract：Objective Hemangiopericytoma (HPC) is rare intracranial tumor .The purpose of this work was to analyze the MRI features of intracranial HPC so as to improve the understanding of this kind of tumor .Methods The clinical and imaging data of 6 intracranial HPC patients proved by operation and pathology were analyzed retrospectively .All cases (4 males ,2 females ,aged 32 to 58 years old ,with an average age of 41) underwent plain and enhanced MRI scan .Results In our 6 cases ,tumors were located in the cerebellopontine angle (2 cases) ,brain parenchyma (3 cases) ,and ventricle (1 case) .All of the tumors manifested as lobulated masses larger than 3 cm with clear boundary .Lesions outside the brain parenchyma were uniform on T1WI ,T2WI and enhanced homogeneously .Intraparenchymal lesions were shown slightly high signal on T1 WI and slightly high ,mixed signal on T2 WI .The signal of tumor in ventricle was slightly lower than the cerebral white matter .After injection of contrast agent ,all of 6 cases showed obvious enhancement with punctate and striped low density areas ,including 2 cases of tumors in the brain parenchyma with crooked striped low density areas . Conclusion Intracranial HPC is rare .MRI morphology and enhanced manifestations are characteristics .Therefore ,sum‐marizing the M RI features can improve the preoperative diagnostic accuracy .