[Imaging features analysis of Erdheim-Chester]

Area of Science:

• Radiology
• Pathology
• Oncology

Background:

• Erdheim-Chester disease (ECD) is a rare non-Langerhans cell histiocytosis.
• Characterized by lipid-laden macrophages infiltrating various organs.
• Accurate imaging is crucial for diagnosis and management.

Purpose of the Study:

• To investigate and characterize the diverse imaging features of Erdheim-Chester disease (ECD).
• To correlate imaging findings with pathological confirmation in a cohort of ECD patients.

Main Methods:

• Retrospective analysis of 7 pathologically confirmed ECD cases.
• Review of imaging modalities including radiography (DR), computed tomography (CT), magnetic resonance imaging (MR), and single-photon emission computed tomography (SPECT).
• Detailed observation of lesion characteristics across different imaging techniques.

Main Results:

• DR images revealed lytic bone changes and cystic alterations.
• CT demonstrated bone dissolution and peripheral sclerosis; no enhancement was observed.
• MR imaging showed varied signal intensities (long T1/T2, short T1/long T2) and inhomogeneous enhancement, particularly in soft tissue lesions.
• SPECT imaging indicated radioactive nuclide concentration in diseased areas.

Conclusions:

• ECD lesions in the capitulum and metaphysis typically present with bone dissolution and peripheral sclerosis on DR and CT.
• Complex MRI findings may relate to varying lipid component proportions.
• SPECT is effective for detecting occult ECD lesions and assessing treatment efficacy.