Case 31432

Abstract
Presentation of CaseA fifteen-year-old boy entered the hospital complaining of pain in the left biceps muscle.After an attack of scarlet fever three years before admission, he noted the gradual development of intermittent stabbing pain in the left biceps muscle, made worse by use of the muscle. There was occasional radiation of pain and numbness to the left hand. A year before admission weakness of the left arm appeared and progressed, and the muscle pain became extremely severe.The past history was noncontributory.Physical examination revealed a well developed and well nourished boy. The heart and lungs were normal. . . .

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