The purpose of this study is to determine how frequently children undergoing elective neurosurgical procedures develop blood clots in the deep veins of the legs while hospitalized. The information gained from this study will help us determine when children children need to receive therapy to help prevent this type of blood clot from forming.
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Number of Participants With Post-operative Ultrasound Without Evidence of Thromboembolism
Timeframe: within 72 hours after surgery