A 40-year-old man visited his physician complaining of pain of 3 weeks' duration in his right shoulder. On examination, the patient could actively abduct his right shoulder to $50^{\circ}$; thereafter, he experienced severe pain that prevented further movement. If the arm was then passively raised above a right angle, it could be held actively without pain in that position. If the patient attempted to lower the arm, he again experienced severe pain in the middle range of abduction. What is your diagnosis?

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The Answer of A 40-year-old man visited his physician complaining of pain of 3 weeks' duration in his right shoulder. On examination, the patient could actively abduct his right shoulder to $50^{\circ}$; thereafter, he experienced severe pain that prevented further movement. If the arm was then passively raised above a right angle, it could be held actively without pain in that position. If the patient attempted to lower the arm, he again experienced severe pain in the middle range of abduction. What is your diagnosis?

A 40-Year-Old Man Visited His Physician Complaining of Pain of 3