Bone marrow aspirate showed diffuse infiltration by a population of monomorphic cells with scant cytoplasm, markedly increased nuclear-to-cytoplasmic ratio, and numerous indistinct nucleoli. Bone marrow biopsy confirmed extensive marrow infiltration by a malignant neoplasm with strong and diffuse expression of synaptophysin by immunohistochemistry, consistent with metastases from Merkel Cell carcinoma.

中文翻译：

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默克尔细胞癌模仿急性白血病

骨髓抽吸物显示出一群单形细胞的弥漫性浸润，细胞质稀少，核质比显着增加，并且有许多模糊的核仁。骨髓活检通过免疫组织化学证实了恶性肿瘤的广泛骨髓浸润，突触素强且弥漫性表达，与默克尔细胞癌的转移一致。