Fig. 1

a Pap-stained cytologic smears from fine needle aspiration of the liver masses (Original magnification × 400) showing characteristic nuclear features of neuroendocrine neoplasm. b Diff Quik stained slides showing cells with eccentric nuclei and binucleate cells (Original magnification × 600). c The liver was infiltrated by monotonous cells with abundant eosinophilic cytoplasm, open chromatin and visible nucleoli (Original magnification × 100). Inset: The tumor cells were diffusely positive for chromogranin (Original magnification × 200). d The tumor cells were also diffusely positive for T-PIT immunohistochemistry (Original magnification × 200)