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A seven-year-old girl was admitted to the hospital because of the superior vena cava syndrome.
She had been in good health until the age of three years five months, when she had pain in her right upper arm of one week's duration. A physician found a mass in her right upper arm. Radiographic examination showed a soft-tissue mass without involvement of the adjacent bone. A magnetic resonance imaging (MRI) study (Figure 1) revealed that the mass arose in the region of the brachialis muscle and displaced the tendon of the biceps muscle; the radial nerve appeared to pass
Differential Diagnosis
Clinical Diagnosis
Dr. Eric Larsen's Diagnosis
Pathological Discussion
Anatomical Diagnosis
References
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