title: Bone marrow infiltrate by a poorly differentiated neuroendocrine carcinoma.
abstract: We report a rare case of bone marrow infiltrate by a neuroendocrine carcinoma. The patient was a 66-year-old man who presented with anemia and thrombocytopenia and with a leukoerythroblastic picture on blood films. A bone marrow biopsy revealed extensive tumor infiltrate with morphological and immunohistochemical features of neuroendocrine origin. There were also multiple nodular lesions in the liver, which showed the same pathology as that in the bone marrow. Since none of the lesions could be identified as the primary tumor, the patient was diagnosed to have a poorly differentiated neuroendocrine carcinoma of unknown primary site.
authors.affiliation: Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, University of Toronto, Toronto, On., Canada.
authors.forename: Ian
authors.initials: I
authors.lastname: Salathiel
authors.forename: Chen
authors.initials: C
authors.lastname: Wang
mesh_terms: D000368:Aged; D001853:Bone Marrow / Q000473:pathology*; D019046:Bone Marrow Neoplasms / Q000556:secondary*; D018278:Carcinoma, Neuroendocrine / Q000556:secondary*; D017809:Fatal Outcome; D006801:Humans; D008297:Male; D009382:Neoplasms, Unknown Primary / Q000473:pathology*; D010166:Palliative Care