# Case Report: The rare pancreatic involvement in Erdheim-Chester disease

## TL;DR

This case report describes a rare instance of pancreatic involvement in Erdheim-Chester disease, emphasizing the importance of molecular testing for accurate diagnosis and treatment.

## Contribution

The report highlights the rare pancreatic manifestation of ECD and the role of BRAF V600E mutation in guiding targeted therapy.

## Key findings

- Pancreatic involvement in ECD is uncommon and can mimic other pancreatitis conditions.
- The BRAF V600E mutation was identified in the patient, confirming ECD and guiding targeted treatment.
- Integrated diagnostic methods, including imaging and molecular analysis, are crucial for timely diagnosis.

## Abstract

Erdheim-Chester disease (ECD) is an exceedingly rare non-Langerhans histiocytosis. While often affecting the skeleton, cardiovascular system, and kidneys, pancreatic involvement remains uncommon and can mimic more prevalent conditions such as autoimmune or chronic pancreatitis.

A 58-year-old female presented with a two-year history of bilateral lower limb edema and a year-long course of recurrent abdominal pain. Imaging suggested necrotizing pancreatitis and retroperitoneal infiltration, yet serum IgG4 levels were normal. A CT-guided biopsy of the pancreas and retroperitoneum revealed diffuse proliferation of foamy histiocytes (CD68+, CD163+, CD1α-) carrying the BRAF V600E mutation, confirming ECD. Supportive therapy and corticosteroids temporarily relieved symptoms, but targeted treatment was delayed due to the COVID-19 pandemic. Subsequent follow-up revealed significant clinical improvement following targeted therapy.

ECD can present with non-specific clinical features, leading to frequent misdiagnoses. Involvement of the pancreas, as demonstrated here, is particularly rare. The discovery of the BRAF V600E mutation underscores the importance of molecular testing for both diagnostic confirmation and therapeutic stratification. The immunopathogenesis of ECD involves activated macrophages and aberrant MAPK signaling, which drive chronic inflammation and tissue fibrosis.

This case highlights the diagnostic challenges of pancreatic ECD and underscores the critical value of an integrated approach—including imaging, immunohistochemistry, and molecular analysis—in achieving timely diagnosis. Early recognition and targeted therapy may significantly improve outcomes for patients with BRAF-mutant ECD.