Yeom, Jung SookSeo, Ji-HyunYoun, Hee-Shang2025-11-122025-11-122022https://hdl.handle.net/20.500.14572/3152Jung Sook Yeom Department of Paediatrics, Health Science Institutes, Gyeongsang National University School of Medicine, Gyeongsang National University Hospital, Jinju, South Korea. Ji-Hyun Seo Department of Paediatrics, Health Science Institutes, Gyeongsang National University School of Medicine, Gyeongsang National University Hospital, Jinju, South Korea. Hee-Shang Youn Department of Paediatrics, Health Science Institutes, Gyeongsang National University School of Medicine, Gyeongsang National University Hospital, Jinju, South Korea.Abstract: Henoch- Schönlein purpura (HSP) is the most common vasculitis of childhood. Subcutaneous edema in the extremities is a common finding of HSP, whereas lumbosacral edema is a rare presentation. We report a case of HSP in a six year old boy who visited the emergency department for acute - onset back pain with gait problems. An extensive radiologic workup was performed, but the patient was finally diagnosed with HSP based on knee and ankle edema with a few purpura. We described the clinical, imaging findings, and treatment of the current case and review the literature regarding this rare presentation of HSP.en-USHenoch-Schönlein purpuraangioedemalow back painArticle