患者 5 6岁 ,因间断性咳嗽、咯血 3个月 ,于 1998年 5月入我院外科。拍胸片见右肺下叶 5 0ｃｍ× 5 5ｃｍ大小单个结节状阴影 ,考虑肺内占位性病变、肺癌可能。故在外科行肺叶切除术。标本肉眼所见 :肿块呈暗红色、质脆 ,切面呈海绵状 ,极似胎盘组织。镜下 :成片生长的异型性 Patients 56 years old, intermittent cough, hemoptysis for 3 months, in May 1998 into our hospital surgery. Thoracocentesis see the right lower lobe of the lung 5 0cm × 5 5cm size of a single nodular shadow, consider the space-occupying lesions in the lungs, lung cancer may be. So in the surgical lobectomy. Specimens visible to the naked eye: mass was dark red, crisp, sponge-like section, like the placenta. Microscope: into pieces of atypia