Rare mediastinal masses - imaging review.

Area of Science:

• Radiology
• Oncology
• Pathology

Background:

• Mediastinal masses present a diverse range of histopathological and radiological features.
• Most mediastinal masses, excluding primary thymic/thyroid tumors and lymphomas, are considered rare.

Purpose of the Study:

• To describe the imaging characteristics of rare mediastinal tumors.
• To emphasize the importance of recognizing these features for diagnosis.

Main Methods:

• Review of imaging findings (Chest radiography, CT, MRI, diffusion studies) for 15 histopathologically confirmed rare mediastinal tumors.
• Correlation of imaging features with final histopathological diagnoses.

Main Results:

• Neuroblastoma (NB) was the most frequent rare mediastinal mass (n=3).
• Other rare tumors included sarcomas (liposarcoma, synovial sarcoma, spindle-cell tumor), Hemangiopericytoma (HPC), single-mass lymphoma, anterior mediastinal neuroendocrine tumor (NET), and posterior mediastinal paraganglioma.
• Imaging modalities like CT and MRI aid in characterization and diagnosis, with diffusion studies helping differentiate benign from malignant.

Conclusions:

• Rare mediastinal tumors exhibit varied imaging appearances.
• Familiarity with the imaging features of these uncommon masses is essential for accurate and timely diagnosis.