WenLi Tan1, WeiYuan Huang, Ji Xiong, JiaWei Pan, DaoYing Geng, Zhang Jun. 1. From the *Department of Radiology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, PR China; †Department of Radiology, and ‡Department of Neuropathology, Huashan Hospital, Fudan University, Shanghai, PR China.
Abstract
OBJECTIVE: The purpose of this study was to characterize the magnetic resonance imaging (MRI), and computed tomographic (CT) findings in a series of 8 patients with papillary glioneuronal tumor (PGNT). METHODS: The routine MRI (n = 8), DWI (n = 7), and CT (n = 4) of 8 PGNTs verified by pathologic examination were reviewed. The location, internal architecture, calcification, attenuation value on CT; and signal features and degree of enhancement of the lesions on MRI were evaluated. RESULTS: Papillary glioneuronal tumor showed relatively characteristic imaging features as well-demarcated masses with cystic degeneration, calcification, and inhomogeneous enhancement. Six of the 8 cases were located in the periventricular area. The solid part of the lesion was isointense (n = 5/8) or hypointense (n = 3/8) to gray matter on T1-weighted imaging. Diffusion-weighted imaging presented heterogeneous hypointensity and isointensity (n = 4/7) or homogeneous hypointensity (n = 3/7) in the solid part of the lesion. CONCLUSIONS: The location adjacent to lateral ventricle, isointensity on T1-weighted imaging, and low signal on DWI may be of some specificity to PGNT.
OBJECTIVE: The purpose of this study was to characterize the magnetic resonance imaging (MRI), and computed tomographic (CT) findings in a series of 8 patients with papillary glioneuronal tumor (PGNT). METHODS: The routine MRI (n = 8), DWI (n = 7), and CT (n = 4) of 8 PGNTs verified by pathologic examination were reviewed. The location, internal architecture, calcification, attenuation value on CT; and signal features and degree of enhancement of the lesions on MRI were evaluated. RESULTS:Papillary glioneuronal tumor showed relatively characteristic imaging features as well-demarcated masses with cystic degeneration, calcification, and inhomogeneous enhancement. Six of the 8 cases were located in the periventricular area. The solid part of the lesion was isointense (n = 5/8) or hypointense (n = 3/8) to gray matter on T1-weighted imaging. Diffusion-weighted imaging presented heterogeneous hypointensity and isointensity (n = 4/7) or homogeneous hypointensity (n = 3/7) in the solid part of the lesion. CONCLUSIONS: The location adjacent to lateral ventricle, isointensity on T1-weighted imaging, and low signal on DWI may be of some specificity to PGNT.