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Detection of malignant cells and expression of creatine kinase in the patient’s cerebral spinal fluid specimen. A: Signet-ring cells (hematoxylin and eosin staining, × 20); B: Malignant epithelial cells (hematoxylin and eosin staining, × 40); C: Positive expression of creatine kinase in carcinoma cells (immunohistochemistry staining, × 40).
