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Asymptomatic Radiation-induced Telangiectasia in Children after Cranial Irradiation: Frequency, Latency, and Dose Relation¹

¹ From the Department of Radiology, Kanagawa Childrens’ Medical Center, Yokohama, Japan (S.K., N.A., M.H., Y.O., K.F.); and Department of Radiology, Yokohama City University School of Medicine, 3–9 Fukuura Kanazawa-ku, Yokohama 236-0004, Japan (S.K., N.A., M.H., Y.O., T.I.). Received September 6, 2002; revision requested November 18; final revision received April 14, 2003; accepted June 10. Address correspondence to S.K. (e-mail: s-koike@ga2.so-net.ne.jp).

View larger version (143K): [in a new window]   Figure 1a. Patient 7. Transverse T2-weighted spin-echo MR images (3,000/100) obtained in 20-month-old girl with telangiectasia. (a) Image obtained 3 years after completion of radiation therapy shows no telangiectatic focus. (b) Image obtained 4 years after completion of radiation therapy shows two telangiectatic foci (arrows) in the left frontal lobe and right parietal lobe.

View larger version (142K): [in a new window]   Figure 1b. Patient 7. Transverse T2-weighted spin-echo MR images (3,000/100) obtained in 20-month-old girl with telangiectasia. (a) Image obtained 3 years after completion of radiation therapy shows no telangiectatic focus. (b) Image obtained 4 years after completion of radiation therapy shows two telangiectatic foci (arrows) in the left frontal lobe and right parietal lobe.

View larger version (172K): [in a new window]   Figure 2a. Patient 14. Transverse MR images obtained for follow-up in 4-month-old girl with progressive telangiectatic focus and no symptoms. (a) T2-weighted fast spin-echo image (3,000/91) obtained 3 years after completion of radiation therapy shows hypointense telangiectatic focus (arrow) in the left temporal lobe. (b) T1-weighted spin-echo image (380/10) obtained 3 years after completion of radiation therapy shows hyperintense telangiectatic focus. (c) T2-weighted fast spin-echo image (3,000/91) obtained 4 years after completion of radiation therapy shows progressive hypointense telangiectatic focus (arrow) that includes a central area of high signal intensity. (d) Contrast material-enhanced T1-weighted spin-echo image (380/10) obtained 4 years after completion of radiation therapy shows irregular hyperintense telangiectatic lesion.

View larger version (159K): [in a new window]   Figure 2b. Patient 14. Transverse MR images obtained for follow-up in 4-month-old girl with progressive telangiectatic focus and no symptoms. (a) T2-weighted fast spin-echo image (3,000/91) obtained 3 years after completion of radiation therapy shows hypointense telangiectatic focus (arrow) in the left temporal lobe. (b) T1-weighted spin-echo image (380/10) obtained 3 years after completion of radiation therapy shows hyperintense telangiectatic focus. (c) T2-weighted fast spin-echo image (3,000/91) obtained 4 years after completion of radiation therapy shows progressive hypointense telangiectatic focus (arrow) that includes a central area of high signal intensity. (d) Contrast material-enhanced T1-weighted spin-echo image (380/10) obtained 4 years after completion of radiation therapy shows irregular hyperintense telangiectatic lesion.

View larger version (159K): [in a new window]   Figure 2c. Patient 14. Transverse MR images obtained for follow-up in 4-month-old girl with progressive telangiectatic focus and no symptoms. (a) T2-weighted fast spin-echo image (3,000/91) obtained 3 years after completion of radiation therapy shows hypointense telangiectatic focus (arrow) in the left temporal lobe. (b) T1-weighted spin-echo image (380/10) obtained 3 years after completion of radiation therapy shows hyperintense telangiectatic focus. (c) T2-weighted fast spin-echo image (3,000/91) obtained 4 years after completion of radiation therapy shows progressive hypointense telangiectatic focus (arrow) that includes a central area of high signal intensity. (d) Contrast material-enhanced T1-weighted spin-echo image (380/10) obtained 4 years after completion of radiation therapy shows irregular hyperintense telangiectatic lesion.

View larger version (161K): [in a new window]   Figure 2d. Patient 14. Transverse MR images obtained for follow-up in 4-month-old girl with progressive telangiectatic focus and no symptoms. (a) T2-weighted fast spin-echo image (3,000/91) obtained 3 years after completion of radiation therapy shows hypointense telangiectatic focus (arrow) in the left temporal lobe. (b) T1-weighted spin-echo image (380/10) obtained 3 years after completion of radiation therapy shows hyperintense telangiectatic focus. (c) T2-weighted fast spin-echo image (3,000/91) obtained 4 years after completion of radiation therapy shows progressive hypointense telangiectatic focus (arrow) that includes a central area of high signal intensity. (d) Contrast material-enhanced T1-weighted spin-echo image (380/10) obtained 4 years after completion of radiation therapy shows irregular hyperintense telangiectatic lesion.