A multilocular thymic cyst with thymoma that was difficult to diagnose preoperatively

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  • 診断に苦慮した胸腺腫合併多房性胸腺嚢胞の1切除例

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An 81-year-old male had an abnormal shadow detected on a screening chest radiograph. Chest radiographs revealed a mass in the anterior mediastinum. Chest CT revealed a heterogeneous lesion in the anterior mediastinum. The MRI revealed an isointense lesion on both T1WI and T2WI, and partially high intensity on DWI. The lesion was suspected to be a thymoma based on these findings, and we resected it using a VATS technique. A histopathological examination revealed the mass to have cystic walls lined by multilayered squamous or cuboidal epithelium and inflammatory changes within the walls. Furthermore, a portion of the mass was type A thymoma. Therefore, the lesion was finally diagnosed as a multilocular thymic cyst with thymoma.

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