Acquired winged scapula in a patient with systemic lupus erythematosus.

A 34-year-old woman presented with a right winged scapula 8 months after developing systemic lupus erythematosus (SLE) with subacute cutaneous manifestations. The patient experienced severe shoulder pain followed by weakness of the right arm in the typically winged scapula fashion. Electromyography of the serratus anterior showed long thoracic nerve palsy. Clinical and laboratory signs did not reveal any associated disease. Paralysis of the long thoracic nerve has never been described before in SLE.