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Intralesional microbleeding in resected thymic cysts indeterminate on imaging.
Julian A Villalba1,2, Adina Haramati3, Michelle Garlin4
1James Homer Wright Pathology Laboratories, Department of Pathology, Massachusetts General Hospital, Boston, MA, USA; Harvard Medical School, Boston, MA, USA.
Mediastinum (Hong Kong, China)
|June 1, 2023
Summary
Thymic cysts can mimic tumors on imaging, leading to unnecessary surgery. Histopathology reveals intralesional microbleeding and fibrosis, explaining their variable appearance on CT and MRI scans.
Area of Science:
- Thoracic imaging
- Mediastinal pathology
- Surgical oncology
Background:
- Thymic cysts may resemble solid thymic epithelial tumors (TETs) on CT scans due to high attenuation values and thickened or calcified walls.
- This imaging similarity can lead to non-therapeutic thymectomy.
- Variable appearance of thymic cysts on CT and MRI over time suggests underlying dynamic processes.
Purpose of the Study:
- To investigate the histopathological features of thymic cysts.
- To correlate these features with imaging findings on CT and MRI.
- To understand the causes of variable appearance of thymic cysts over time.
Main Methods:
- Retrospective identification of completely excised thymic cysts over a 20-year period.
- Exclusion of cysts with unavailable presurgical imaging, prevascular location, or associated enhancing masses.
- Histopathological analysis of cyst material and radiological analysis of presurgical imaging.
Main Results:
- 18 thymic cysts were identified after applying exclusion criteria.
- Histopathology revealed intralesional microbleeding (78%), remodeling (44%), capsular scarring (89%), and fat necrosis (67%).
- Imaging showed high CT attenuation values (65%), wall calcification (35%), and variable MRI signal intensities consistent with hemorrhagic or fibrotic content.
Conclusions:
- Thymic cysts frequently exhibit signs of intralesional microbleeding, inflammation, and fibrosis.
- These pathological findings likely explain the observed variability in cyst appearance on CT and MRI.
- Understanding these features can help differentiate thymic cysts from solid tumors, potentially avoiding unnecessary surgery.
