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Exuberant granulomatous reaction masking primary mediastinal seminoma
Sally Ziatabar1, Brittany Bass1, Liying Han2
1Division of Pulmonary, Critical Care, and Sleep Medicine, Westchester Medical Center, Valhalla, NY, USA.
The Journal of the Royal College of Physicians of Edinburgh
|November 6, 2025
Summary
Primary mediastinal seminoma can mimic other conditions due to a granulomatous reaction. Recognizing this association is crucial for accurate diagnosis of anterior mediastinal masses in young men.
Area of Science:
- Oncology
- Pathology
Background:
- Primary mediastinal seminoma is a key differential diagnosis for anterior mediastinal masses.
- Young men are the typical demographic affected by this condition.
Purpose of the Study:
- To illustrate a case where seminoma presents with a florid granulomatous reaction.
- To highlight the potential for diagnostic confusion in small biopsies.
Main Methods:
- Case illustration of a primary mediastinal seminoma.
- Analysis of a core needle biopsy from an anterior mediastinal mass.
Main Results:
- The seminoma elicited a significant granulomatous inflammatory response.
- The granulomatous reaction obscured the neoplastic cells in the biopsy.
Conclusions:
- A florid granulomatous reaction can mask primary mediastinal seminoma.
- Awareness of this presentation is essential to avoid misdiagnosis.
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