Enlarged Parietal Foramina: MR Imaging Features in the Fetus and Neonate
A.M. Finka,c,d and
W. Maixnerb
a Department of Medical Imaging, The Royal Children’ Hospital, Melbourne, Australia
b Department of Neurosurgery, The Royal Children’ Hospital, Melbourne, Australia
c Department of Radiology, University of Melbourne, The Royal Women’s Hospital, Melbourne, Australia
d Fetal Management Unit, The Royal Women’s Hospital, Melbourne, Australia
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Fig 1. Patient 1. Obstetric sonogram at 19 weeks gestation.
Parasagittal image of the brain shows the calvarial defect and cyst covered by dura and skin (white arrow).
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Fig 2. Patient 1. Fetal and neonatal brain MRIs.
Upper, Fetal MRI at 23 weeks gestation (single-shot, fast spin-echo).
Middle, Fetal MRI at 36 weeks gestation (single-shot, fast spin-echo).
Lower, Neonatal MRI (fast spin-echo T2).
A, Sagittal images.
B, Axial level of the thalami (upper) and parietal bones (lower).
C, Coronal level with the posterior lateral ventricles (upper) and parietal bones (lower).
Note: White arrows, parietal foramina with calvarial defects initially filled by CSF and then brain; black arrows, course of the abnormal interhemispheric venous drainage. Note the absence of the normally positioned straight sinus.)
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Fig 3. Patient 2. MRI at 1 month of age (FSE T2; white arrows, parietal foramina with calvarial defects; black arrows, course of the abnormal interhemispheric venous drainage, note absence of the normally positioned straight sinus).
A, Sagittal images.
B, Axial level of the thalami (upper) and parietal bones (lower).
C, Coronal level with the posterior lateral ventricles (upper) and parietal bones (lower).
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