Infections caused by Onchocerca species, a filarial parasite, other than those caused by Onchocerca volvulus, are rare in humans. Six cases of Onchocerca gutturosa or Onchocerca cervicalis infection in humans have been reported previously1-5. These cases occurred in Switzerland, Crimea, Canada, Illinois, and Japan (two cases). We describe the case of a Minnesota resident who had a subdeltoid mass that was caused by Onchocerca gutturosa.
A fifty-year-old, left-hand-dominant woman presented with a one-year history of a gradually enlarging mass in the anterior part of the left shoulder. She reported a recent increase of pain in the involved shoulder. The patient had no history of injury or unusual medical conditions, and she had not traveled outside of the United States. Physical examination demonstrated a generalized enlargement of the anterior part of the left shoulder. A fluid-filled, subdeltoid mass measuring 4 cm × 5 cm was noted. Both neurovascular function and rotator cuff function were intact. The patient reported pain with range of motion. The Hawkins and Neer impingement tests, consisting of forced forward flexion of the shoulder to 90° and 180° in internal rotation, were both positive. The anterior region of the shoulder was tender to palpation in the area …
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