Fig. 2
From: Meningeal carcinomatosis secondary to neurenteric cysts with malignant transformation: a case report
Histologic examination. A-1. Atypical nuclei are noted in CSF cytology. A-2. Fibrocystic wall-like tissue, covered by columnar epithelium and mucus epithelium, with partial malignant characteristics. A-3, B, C. Immunostaining results. A-3. CK positive. B-1. CK7 positive. B-2. Partially CK20 positive. B-3. CEA positive. C-1. P53 positive. C-2. Partially CDX-2 positive. C-3. Ki-67 staining shows a proliferation rate of 20%. Abbreviations: CEA, carcinoembryonic antigen; CK, cytokeratin