A 70-year-old @entity1 was admitted to our hospital for treatment of an anterior mediastinal @entity5 . Although he was asymptomatic, an abnormal shadow was visible on chest radiography. CT revealed a heterogeneous @entity5 located in the anterior mediastinum. On MRI, the @entity5 demonstrated low signal intensity in T1-weighted images and high signal intensity in T2-weighted images. Laboratory data, including @entity5 markers, were mostly within the reference ranges. Although a CT-guided needle biopsy was performed, histologic diagnosis could not be confirmed. We resected the @entity5 with the thymus by median sternotomy. Histopathological examination demonstrated that the @entity5 was a multilocular @entity20068 with @entity8792 and numerous lymphocytes. The lining epithelial cells gave positive reactions to immunohistochemical staining for @entity1735 antigen 19-9. Carcinoembryonic antigen and @entity957 antigen levels in the cystic fluid were elevated. This case appeared to be an acquired @entity20068 with @entity8792 . There are few reports of such cysts.

[A case of XXXX with @entity8792 ].

@entity1 :: ('9606', 'Species') :: ['man'] @entity20068 :: ('MESH:D008476', 'Disease') :: ['thymic cyst'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor'] @entity957 :: ('MESH:D002294', 'Disease') :: ['squamous cell carcinoma'] @entity1735 :: ('CHEBI:16646', 'Chemical') :: ['carbohydrate'] @entity8792 :: ('MESH:D013952', 'Disease') :: ['thymic hyperplasia']
@entity20068 :: (MESH:D008476,Disease) :: ['thymic cyst']
