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A vesicular rash of the right T11T12 dermatomes developed in a 75-year-old man. Four weeks later, as the rash was resolving (Panel A), he noticed a protrusion of the right abdominal wall associated with skin pain (Panel B). Examination revealed a pseudohernia of the abdominal wall measuring 5 by 5 cm, hypesthesia of the overlying skin, and upward and leftward movement of the umbilicus on abdominal flexion. Magnetic resonance imaging (MRI) of the abdomen did not reveal a hernia or mass. Electromyography revealed denervation changes limited to the right thoracic paraspinal and infraumbilical muscles (T11T12 myotomes). MRI of the thoracic . . . [Full Text of this Article] |