転移性肺腫瘍との鑑別を要した肺類上皮血管内皮腫の1例

Pulmonary Epithelioid Hemangioendothelioma Requiring Differentiation from Metastatic Lung Tumor：Report of a Case

はじめに　肺類上皮血管内皮腫は血管内皮由来の腫瘍で，2002年の世界保健機関（WHO）分類から悪性血管性腫瘍に分類されている1）．また，多発結節として発見されることが多く，単発は少ない2）．

Background：Pulmonary epithelioid hemangioendothelioma is a rare malignant disease, and most cases are found as multiple lung nodules, rarely as a single nodule.

Case：Computed tomography （CT） in a 71-year-old man revealed a growing 3-mm lung nodule in the left S6 after rectal cancer operation. Wedge resection was performed. A pathological examination resulted in a diagnosis of pulmonary epithelioid hemangioendothelioma based on CD31 and CD34 positivity in immunohistochemistry.

Conclusion：When new nodules are noted on routine CT scans of other malignancies, it is essencial to make a pathological diagnosis, bearing in mind that pulmonary nodules can arise from a variety of causes.