Focal Pyomyositis of the Perisciatic Muscles in Children
Ramiro J. Hernandez1,
Peter J. Strouse1,
Clifford L. Craig2 and
Frances A. Farley2
1 Department of Radiology, University of Michigan Health System, C.S. Mott
Children's Hospital, 1500 E. Medical Center Dr., Ann Arbor, MI
48109-0252.
2 Department of Orthopedics, University of Michigan Health System, C.S. Mott
Children's Hospital, Ann Arbor, MI 48109-0252.

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Fig. 1A. 17-year-old boy with 3-day history of pain and inability to
walk. Axial fat-suppressed fast spin-echo proton density MR image (TR/TE,
4166/15) shows increase in signal intensity of right piriformis muscle
(arrow).
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Fig. 1B. 17-year-old boy with 3-day history of pain and inability to
walk. Axial fat-suppressed T1-weighted MR image (550/14) obtained after
gadolinium administration shows marked enhancement of right piriformis muscle
(arrow) and adjacent structures, such as gluteus medius muscle
(arrowhead).
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Fig. 2A. 13-year-old boy with 2-day history of pain and inability to
walk. Fast spin-echo T2-weighted axial MR image (TR/TE, 4000/90) obtained
through pelvis shows soft-tissue mass with increased high signal intensity
involving right piriformis muscle (arrow).
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Fig. 2B. 13-year-old boy with 2-day history of pain and inability to
walk. Fast spin-echo inversion recovery coronal MR image (5500/24; inversion
time, 165 msec) shows high signal intensity involving structures in right
sciatic notch (arrow).
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Fig. 2C. 13-year-old boy with 2-day history of pain and inability to
walk. Axial fat-suppressed T1-weighted MR image (650/14) obtained after
gadolinium administration shows enhancement of soft-tissue mass involving
right piriformis muscle (arrow). Within mass, low-signal-intensity
areas (arrowhead), probably representing small abscesses, are
visible.
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Fig. 3A. 6-year-old girl with 1-day history of left hip pain. Axial
fat-suppressed fast spin-echo T2-weighted MR image (TR/TE, 4000/60) shows
increase in signal intensity of left superior gemellus (arrow) and
obturator internus (arrowhead) muscles.
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Fig. 3B. 6-year-old girl with 1-day history of left hip pain. Axial
fat-suppressed T1-weighted MR image (750/14) obtained after gadolinium
administration shows marked enhancement of left superior gemellus
(arrow) and obturator internus (arrowhead) muscles.
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Fig. 3C. 6-year-old girl with 1-day history of left hip pain. Axial
fast spin-echo T2-weighted MR image (4000/60) shows increase in signal
intensity of left obturator internus muscle (arrowheads) and
perisciatic soft tissues. Arrow denotes expected location of sciatic
nerve.
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Fig. 3D. 6-year-old girl with 1-day history of left hip pain. Axial
fat-suppressed T1-weighted MR image (750/14) obtained after gadolinium
administration shows marked enhancement of left obturator internus muscle
(arrowheads) and perisciatic soft tissues. Arrow denotes expected
location of sciatic nerve.
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Copyright © 2002 by the American Roentgen Ray Society.