Purpose To investigate the MRI characteristics and differential diagnosis of intraventricular meningioma. Materials and Methods The clinical manifestation and MRI characteristics was retrospectively analyzed in the 11 patients with confirmed intraventricular meningioma by pathology. Results The intraventricular fibrocellular meningioma (7 cases) showed iso- and slightly short T1 signal and short and heterogeneously iso-T2 signal. The syncytial (1 case) and mixed (1 case) miningioma in the fourth ventricle, the syncytial meningioma in the third ventricle, and endothelial meningioma in the septum pellucidum (1 case) all showed slightly long T1 and slightly long T2 signal. Pathology results showed that 7 cases of fibrocellular meningioma in lateral ventricle, 1 case of syncytial meningioma and mixed type in the fourth ventricle, 1 case of syncytial meningioma in the third ventricle, 1 case of endothelial meningioma in septum pellucidum Conclusion The fibrocellular type was commonly encountered for the lateral ventricle meningioma, and hypointensity on T2WI could be regarded as its typical MRI characteristics, and it is diffcult for the differential diagnosis for the other intraventrical meningiomas.

Purpose The clinical manifestation of insufficiency fracture (IF) is in lack of specificity,thus it is prone to misdiagnosis.This paper aims explore imaging characteristics of 99Tcm-MDP whole-body bone scan and local SPECT/CT tomography for IF in the anticipation to improve its cognition and diagnosis capability to imaging manifestations.Materials and Methods Thirty patients who were diagnosed as IF by follow-up or imaging in Affiliated Hospital of Southwest Medical University from September 2015 to September 2016 were enrolled.The imaging features of their whole-body bone scan and local S PECT/CT tomography were retrospectively analyzed.Results For 30 patients,20 cases were single bone lesion,and 10 cases were multiple bone lesions.Lesions on the whole-body scan were represented as developer concentration of different level.Fracture line,sclerosis rim/line,soft tissue swelling,wedge-shaped or concave deformity of the vertebra could be observed on the images of SPECT/CT scan.Osteoporosis of different level could be seen on all the 30 patients.No bone destruction could be seen on the lesions and no obvious soft tissue mass around the lesions were formed.Conclusion Manifestation of whole-body bone scan and local SPECT/CT scan of IF is with certain specificity and is of significance in the early-stage diagnosis and differential diagnosis of IF.