Anterior mediastinal solid tumours in adults: characterisation using dynamic contrast-enhanced MRI,...

Area of Science:

• Radiology
• Oncology
• Medical Imaging

Background:

• Anterior mediastinal solid tumors encompass a diverse group of neoplasms.
• Accurate characterization is crucial for appropriate patient management and treatment planning.

Purpose of the Study:

• To identify significant imaging parameters for characterizing adult anterior mediastinal solid tumors.
• To evaluate the utility of dynamic contrast-enhanced MRI (DCE-MRI), diffusion-weighted MRI (DWI), and FDG-PET/CT in this differentiation.

Main Methods:

• Analysis of 48 histologically confirmed anterior mediastinal solid tumors.
• Parameters assessed included maximal diameter, capsule/septa, time-signal intensity curves (TICs), apparent diffusion coefficient (ADC), and maximum standardized uptake value (SUVmax).
• A validation cohort of 42 tumors was used to confirm findings.

Main Results:

• Washout pattern on TICs was specific to thymic epithelial tumors (20/32).
• Higher SUVmax values were observed in lymphoma, malignant germ cell tumors, and thymic carcinomas compared to thymomas.
• Thymic epithelial tumors had a significantly smaller maximal diameter than lymphomas and malignant germ cell tumors.

Conclusions:

• SUVmax, DCE-MRI TICs, and maximal diameter are valuable parameters for differentiating anterior mediastinal solid tumors in adults.
• Combined imaging modalities offer high accuracy in tumor characterization.
• These findings can aid in non-invasive diagnosis and treatment stratification.