PMC2713835_01
Clear-cell meningioma in a 14-month-old girl.. A, B. Initial T1- and T2-weighted sagittal MR images of the thoracolumbar spine reveal the presence of a well-demarcated, ovoid mass (arrows) in the intradural extramedullary spinal canal at the level of T12-L2. The mass is isointense to the spinal cord on both T1- and T2-weighted images.. C. Initial contrast-enhanced T1-weighted sagittal MR image shows strong, homogeneous enhancement.. D. T2-weighted sagittal MR image obtained eight months later shows a recurrent isointense signal of the intradural mass (arrows) at the site of initial surgery.. E. Contrast-enhanced T1-weighted sagittal MR image obtained after a further interval of seven months depicts a recurrent well-enhanced intradural mass at the site of previous surgery.
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F1
Both T1- and T2-weighted images showed that the mass was isointense to the spinal cord and contrast enhancement was strong and homogeneous (Figs. 1A-C). Eight months after initial sugery, the patient showed sudden general irritability, and T2-weighted images of the spine revealed a recurrent intradural mass at exactly the same site (Fig. 1D). MR imaging again showed a recurrent, well-enhanced, intradural mass at the site of previous surgery (Fig. 1E).
PMC2713835_02
Clear-cell meningioma in a 17-year-old girl.. A. Precontrast axial CT scan shows a huge, irregular, mixed solid and cystic mass in the left cerebellopontine angle. The cystic portion of the mass (open arrows) is located anteriorly and is expansile. The clivus is grossly eroded by the mass, whose solid portion (white arrows) is slightly hyperdense on precontrast CT scans and contains multiple, small, irregular areas of low attenuation that suggest cystic change or necrosis.. B. Contrast-enhanced axial CT scan. The solid portion of the mass (white arrows) is mildly and homogeneously enhanced.. C. T1-weighted axial MR image depicts a large, multilobulated, mixed solid and cystic mass with a dorsal exophytic component in the upper medulla. It extends superiorly to the pons, and the brainstem is displaced to the right and posterosuperiorly. In the solid portion of the mass (white arrows), an isointense signal with a central area of high intensity is observed.. D. T2-weighted axial MR image shows a heterogeneous isointense signal with a central area of high intensity in the solid portion of the mass (white arrows). There is associated mild hydrocephalus.. E, F. Contrast-enhanced T1-weighted axial and sagittal MR images. After the use of contrast agent, the solid portion of the mass showed strong, homogeneous enhancement.
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CT scans and contained multiple, small, irregular areas of low attenuation that suggested cystic change or necrosis (Fig. 2A). Contrast-enhanced axial CT scanning revealed mild, homogeneous enhancement of the solid portion of the mass (Fig. 2B), and MR imaging indicated that a large, multilobulated, mixed solid and cystic mass with a dorsal exophytic component was present in the upper medulla. There was associated mild hydrocephalus (Figs. 2C-F).