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MRI features of atypical teratoid/rhabdoid tumors in children
1Department of Radiology, Huashan Hospital, Fudan University, 12 Middle Wulumuqi Rd., Shanghai, 200040, People's Republic of China.
Background:
Atypical teratoid/rhabdoid tumors (AT/RTs) are rare, highly malignant tumors of the central nervous system, usually occurring in young children.
Objective:
To investigate the MRI features of AT/RT, with special emphasis on diffusion-weighted imaging (DWI) and MR spectroscopy (MRS).
Materials And Methods:
MRI findings of 11 children with AT/RT were reviewed retrospectively, including DWI in 9 AT/RT children and MRS in 6 children.
Results:
The neoplasms were infratentorial in 4 children and supratentorial in 5 children, both infra- and supratentorial in 1 child and multifocal in 1 child. AT/RT produced heterogeneous signal intensity from peripheral cysts in 7/11 (63%) and hemorrhage in 7/11 (63%). All lesions showed contrast enhancement of varying degrees. Seven (63%) had peritumoral edema. Nine (82%) were hyperintense on DWI with a mean ± SD ADC of 0.60 ± 0.13 × 10(-3) mm(2) s(-1). Six lesions (55%) exhibited elevated levels of choline and decreased NAA, and three had lipid peaks.
Conclusions:
A childhood intracranial tumor with off-midline location, peripheral cystic components, hemorrhage, low ADC, and lipid peaks on MRS suggests AT/RT to be considered a differential diagnosis.
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