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Multilocular thymic cyst: an acquired reactive process. Study of 18 cases
1Department of Pathology, Yale University School of Medicine, New Haven, CT 06510.
The American Journal of Surgical Pathology
|April 1, 1991
Summary
Multilocular thymic cysts (MTC) are typically asymptomatic anterior mediastinum masses. Histologic analysis suggests MTC arises from inflammation-induced cystic changes in thymic duct epithelium, similar to other inflammatory cystic conditions.
Area of Science:
- Thoracic Pathology
- Mediastinal Lesions
- Cystic Diseases
Background:
- Multilocular thymic cyst (MTC) is a rare condition of the anterior mediastinum.
- MTC is often incidentally discovered on chest imaging.
- Some MTC cases present with acute symptoms like chest pain or dyspnea.
Purpose of the Study:
- To investigate the clinical and pathologic features of multilocular thymic cysts (MTC).
- To understand the pathogenesis of MTC, distinguishing it from thymic tumors.
Main Methods:
- Retrospective analysis of 18 cases of MTC.
- Detailed histopathologic examination of cyst lining, thymic tissue, and inflammatory components.
- Correlation of clinical presentation with pathologic findings.
Main Results:
- Most MTC cases were asymptomatic.
- Histologic features included cystic cavities lined by epithelium, thymic tissue remnants, inflammation, and lymphoid hyperplasia.
- Two MTC cases were associated with thymoma, and two with thymic carcinoma.
Conclusions:
- MTC likely results from inflammatory processes causing cystic transformation of thymic duct epithelium.
- Pathogenesis may be analogous to inflammatory cystic conditions in the head and neck.
- MTC is distinct from thymic tumors, though incidental thymomas or carcinomas can coexist.