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Review Question - QID 6612

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QID 6612 (Type "6612" in App Search)
A 27-year-old woman reports the acute atraumatic onset of burning pain in her right shoulder followed a week later by significant weakness and the inability to abduct her shoulder. One week prior to this incident she had recovered from a flu-like syndrome. Examination reveals full passive motion of the shoulder and the inability to actively raise the arm. Sensation in the right upper extremity is normal. Cervical spine examination is normal. Radiographs of the shoulder and cervical spine are normal. What is the most likely diagnosis?