Erdheim-Chester Disease Manifesting Without Long Bone Involvement.

Area of Science:

• Histiocytosis
• Rare diseases
• Oncology

Background:

• Erdheim-Chester Disease (ECD) is a rare non-Langerhans cell histiocytosis.
• Characterized by foamy histiocyte proliferation and multi-organ infiltration.
• Typically presents with osteosclerosis of long bones.

Purpose of the Study:

• To report an atypical case of Erdheim-Chester Disease.
• To highlight the absence of skeletal involvement in a patient with widespread organ infiltration.

Main Methods:

• Case report.
• Review of clinical presentation, imaging, and pathology.

Main Results:

• The patient exhibited widespread organ infiltration characteristic of ECD.
• Notably, the patient lacked the typical osteosclerosis of long bones.
• Diagnosis was confirmed despite the atypical skeletal presentation.

Conclusions:

• Erdheim-Chester Disease can present atypically without bone involvement.
• This case underscores the importance of considering ECD even with unusual manifestations.
• Further research into ECD variants may be warranted.