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Approach to mediastinal cytopathology: a diagnostic overview.
1Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH, USA.
Mediastinum (Hong Kong, China)
|July 10, 2026
Summary
Accurate diagnosis of mediastinal lesions using fine-needle aspiration (FNA) is crucial. This review details a systematic approach to mediastinal cytopathology, integrating morphology with advanced techniques for improved patient management.
Area of Science:
- Cytopathology
- Thoracic Oncology
- Diagnostic Pathology
Background:
- The mediastinum harbors diverse lesions, necessitating precise diagnosis for effective management.
- Fine-needle aspiration (FNA), especially with ultrasound guidance (EBUS-TBNA, EUS-FNA), is key for minimally invasive mediastinal evaluation.
- Cytologic evaluation poses challenges due to overlapping features and limited specimen material.
Purpose of the Study:
- To provide a comprehensive review of mediastinal cytopathology.
- To outline a systematic diagnostic approach integrating morphology and ancillary studies.
- To highlight key entities, diagnostic pitfalls, and emerging technologies.
Main Methods:
- Systematic review of mediastinal cytopathology literature.
- Emphasis on specimen adequacy and cytomorphologic interpretation.
- Integration of immunocytochemistry, flow cytometry, molecular testing, and digital cytology/AI.
Main Results:
- Identified key mediastinal entities: reactive lymphoid hyperplasia, granulomatous inflammation, thymic tumors, lymphomas, germ cell tumors, and metastatic malignancies.
- Highlighted the importance of ancillary studies for lineage, clonality, and targeted therapy.
- Discussed diagnostic pitfalls and the utility of an algorithmic workflow.
Conclusions:
- A systematic approach combining cytomorphology with clinical, radiologic, and molecular data enhances diagnostic accuracy and efficiency for mediastinal lesions.
- Advanced techniques like NGS, digital cytology, and AI are improving molecular profiling and diagnostic reproducibility.
- Accurate cytopathologic diagnosis is essential for guiding patient management strategies.
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