Dermatomyositis with renal infarction: a case report and literature review.

Renal infarction is a rare clinical entity that is not easily detected by low-sensitivity ultrasound. We herein report a case of dermatomyositis with renal infarction detected during corticosteroid therapy. The patient was followed up for 18 months. A woman who was clinically diagnosed with dermatomyositis complained of severe pain in the right flank of the low back and abdomen, accompanied by nausea and vomiting during corticosteroid therapy. Based on the findings of routine blood tests, abdominal X-ray radiography, and abdominal ultrasound, the patient was diagnosed with acute gastroenteritis and treated with levofloxacin. However, her symptoms were not relieved. Abdominal contrast-enhanced computed tomography revealed renal infarction. Clinicians should be alert to the occurrence of thrombosis, especially when it manifests as vasculitis in patients with rheumatic disease who complain of severe abdominal pain, because it may suggest the presence of renal infarction.