Health A-Z

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Symptoms include persistent pain and swelling in an arm or leg, especially near the knee or shoulder. Pain may occur at rest, and it may even wake the person from sleep. It may be mistaken at first for a sprain or other sports injury, particularly in active teenagers.

There also may be a firm lump on an arm or leg. The lump may be tender.

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From Health A-Z, Harvard Health Publications. Copyright 2007 by the President and Fellows of Harvard College. All rights reserved. Written permission is required to reproduce, in any manner, in whole or in part, the material contained herein. To make a reprint request, contact Harvard Health Publications. Used with permission of StayWell.

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