Tne cases of growing fractures seen in the last 10 years are presented. Six of the patients sustained their injury within the first six months of life. The defects formed rapidly, several within two or three months after injury. There was enlargement of the defect in only one case after the date of discovery. Although the defects involved the parietal bone most commonly, in four out of 10 the lesion crossed either the coronal or the lambdoid suture. The edges of the defects were usually thickened; in some areas they were saucer-shaped but in two cases there was erosion of the outer table of the skull at a distance from the margin of the defect, the erosion being related to an extracranial fluid-filled cavity in continuity with a porencephalic cyst. The ipsilateral ventricle was usually dilated and in a number of cases was associated with a porencephalic cyst. In no case was a "leptomeningeal cyst" found beneath the defect at operation. A detailed review confirms many of the findings previously described but suggests that the pathology of the condition is still not fully understood. Computed tomography, undertaken in one case, appears to be the examination of choice. Further light may be thrown on the pathogenesis of this condition by the use of intracystic, intrathecal, and intraventricular water-soluble contrast media.
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