Sclerosing XXXX of unknown origin: Report of a case.

@entity5 @entity134 @entity1 @entity1764
INTRODUCTION: We herein describe a rare case of a sclerosing @entity1764 without IgG4-related disease. This case was clearly excluded from IgG4-related disease, because this patient's serum IgG4 level was not elevated. Specifically, this patient's serum IgG4 level was 7.9mg/dl (4.8-105). PRESENTATION OF CASE: A 61-year-old Japanese female presented at our hospital due to an abnormal chest X-ray that showed a growing shadow in the mediastinum. Chest computed tomography (CT) showed an 80*75*75mm @entity5 , which located in the anterior mediastinum. This large @entity5 surrounded the thoracic aorta, left brachiocephalic vein and superior vena cava. It was difficult to obtain a definitive diagnosis. We tried to perform three biopsies, and eventually performed a partial resection of the @entity5 . DISCUSSION: This case did not fit the criteria for IgG4-related disease, and it was therefore unclear whether @entity134 therapy should be used for this case. We will continue to carefully follow up this @entity1 's residual lesion, and there have been no changes in the lesion at present. CONCLUSION: Sclerosing @entity1764 and IgG4-related disease should be included in the differential diagnosis of @entity1 presenting with a @entity5 . However, sclerosing @entity1764 is difficult to diagnose, and it is important to obtain a sufficient amount of tissue to ensure an accurate diagnosis.
