Computed tomography of a Japanese man in his mid-forties with a complaint of right-side chest pain showed a dome-shaped smooth-surfaced mediastinal mass, which was extirpated. The cut surface was highly hemorrhagic and necrotic and not related to the original pulmonary tissues. Although routine sectioning detected bronchial cartilage, immunohistochemical analyses clearly showed the presence of alveolar type II cells; only the alveolar type II cells located at the periphery of this mass showed positive staining for cytokeratins, thyroid transcription factor 1, surfactant protein A, epithelial membrane antigen and Krebs von den Lungen-6. Thus, these analyses are useful for the detection of pulmonary components, even in severely hemorrhagic and necrotic tissues with marked sequestration. The clinical diagnosis was a rare, adult type of extralobar pulmonary sequestration accompanied by chest pain.
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机译：一名日本男子在四十多岁的计算机断层扫描中抱怨右侧胸痛，发现穹do状表面光滑的纵隔肿块被切除。切面高度出血和坏死，与原始肺组织无关。尽管常规切片检测到支气管软骨，但免疫组织化学分析清楚地显示了肺泡II型细胞的存在。仅位于该肿块外围的II型肺泡细胞对细胞角蛋白，甲状腺转录因子1，表面活性剂蛋白A，上皮膜抗原和Krebs von den Lungen-6染色呈阳性。因此，这些分析对于检测肺部成分非常有用，即使在严重隔离的严重出血和坏死组织中也是如此。临床诊断为罕见的成人型叶外肺隔离症，伴有胸痛。
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