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[A case of thymic cyst with thymic hyperplasia]
Eiji Yatsuyanagi1, Katsuyuki Kusajima, Chikako Takezawa
1Department of Chest Surgery, National Obihiro Hospital, Obihiro, Japan.
Summary
A rare case of an acquired multilocular thymic cyst with thymic hyperplasia was found in a 70-year-old man. This anterior mediastinal tumor presented atypically, requiring surgical resection for diagnosis.
Area of Science:
- Thoracic Surgery
- Pathology
- Radiology
Background:
- Anterior mediastinal tumors can present asymptomatically, posing diagnostic challenges.
- Imaging modalities like CT and MRI are crucial for characterizing mediastinal masses.
- Histopathological confirmation is often necessary for definitive diagnosis of rare conditions.
Observation:
- A 70-year-old male presented with an incidental finding of an anterior mediastinal mass on chest radiography.
- CT revealed a heterogeneous mass, and MRI showed characteristic signal intensities (low T1, high T2).
- Initial CT-guided biopsy was inconclusive, necessitating surgical intervention.
Findings:
- Surgical resection via median sternotomy revealed a multilocular thymic cyst with thymic hyperplasia.
- Immunohistochemical staining showed positive reactions for carbohydrate antigen 19-9 in the cyst lining.
- Elevated levels of carcinoembryonic antigen and squamous cell carcinoma antigen were noted in the cystic fluid.
Implications:
- This case highlights an unusual presentation of an acquired thymic cyst, a rare entity.
- The findings underscore the importance of surgical pathology in diagnosing complex mediastinal lesions.
- Further research into the pathogenesis and clinical behavior of acquired thymic cysts is warranted.