Reference no: EM133592385

Question: Mr. Summers is treated with a 5-day course of cephalexin for presumed cellulitis and returns to the clinic in 1 week for a follow-up visit. He reports no change in his symptoms except that the pain seems to be getting worse when he walks. He continues to have no systemic symptoms and otherwise feels well. On additional history gathering, he remembers that swelling in his left leg actually began about a week before he saw you, although he did not relate that to the redness and pain that initially led him to seek care on his last visit. He still does not recall any specific trauma to his lower extremity, although he does report that about 3 weeks ago he had started a new fitness class that involves moderate-impact exercise. Physical examination shows that he remains afebrile, with normal vital signs. His left lower-extremity examination is unchanged from his prior evaluation. You review the plain radiographs of the left foot and ankle obtained at his last visit and confirms the formal interpretation of no evidence of fracture or foreign body. Which of the following is the most appropriate next step in management? A Duplex ultrasonography B MRI of the foot