Fig. 1
From: Neuroendocrine carcinoma of the colon presenting as acute meningitis
Lumbar puncture cytology. a Papanicolaou stain of CSF showing an atypical population of tumor cells with stippled chromatin and mitotic figures readily identified (arrow). b Cluster of tumor cells showing positive granular cytoplasmic staining with synaptophysin and (c) Cluster of tumor cells showing positive perinuclear staining with Cytokeratin AE1/AE3 in a typical “dot pattern”