Abdominal Extrarenal Involvement in Erdheim-Chester Disease in a Cohort of 304 Patients

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Abstract
Erdheim-Chester disease (ECD) is a multisystem tissue accumulation of foamy histiocytes with constant activation of the mitogen-activated protein kinase pathway leading to organ dysfunction. Specific imaging features, such as perirenal fat stranding, bilateral osteosclerosis of the long bones, parietal aortic-arch sheathing, and sclerosing facial sinuses are well described, though very few descriptions of the involvement of abdominal organs outside the retroperitoneum are reported.1-3 The aim of this study was to estimate the prevalence of nonretroperitoneal abdominal organ involvement in ECD in a large cohort of patients.