[Renal involvement in Erdheim-Chester disease]

Area of Science:

• Rare Histiocytosis
• Erdheim-Chester Disease (ECD)
• Langerhans Cell Histiocytosis Spectrum

Context:

• Erdheim-Chester disease (ECD) is a rare non-Langerhans cell histiocytosis, distinguished since 1987.
• Diagnosis relies on radiological bone imaging and pathological histiocytic infiltration criteria.
• Bone disease is crucial, but systemic manifestations and renal involvement are frequently reported at onset.

Purpose:

• To review and analyze literature reports on renal involvement in Erdheim-Chester disease.
• To highlight the three primary pathological mechanisms of renal involvement in ECD.
• To discuss current management strategies for renal manifestations in ECD patients.

Summary:

• Renal involvement in ECD is typically asymptomatic at onset and during follow-up.
• Pathological mechanisms include direct renal/retroperitoneal infiltration, urinary tract obstruction, and renal artery stenosis.
• No current treatment improves ECD patient survival; renal management is symptomatic or involves a 'wait-and-see' approach.

Impact:

• Provides a comprehensive overview of renal pathology in Erdheim-Chester disease.
• Clarifies the mechanisms and asymptomatic nature of renal involvement.
• Informs clinical management strategies for renal complications in this rare disease.