title: Extensive extramedullary hematopoiesis in a thyroid nodule.
abstract: We describe a case of extramedullary hematopoiesis in a hyperplastic thyroid nodule from a patient with primary myelofibrosis. The presence of extensive extramedullary hematopoiesis in the thyroid gland was suspected as a result of fine-needle aspiration cytologic examination and was confirmed by histo- and immunomorphologic examination of the resected nodule. The diagnosis of myelofibrosis was established on the basis of clinical findings, hematologic laboratory results, and bone marrow morphologic characteristics.
authors.affiliation: Institute of Pathology Anatomy and Histology, University of Siena, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Lazzi
authors.forename: C
authors.initials: C
authors.lastname: Als
authors.forename: L
authors.initials: L
authors.lastname: Mazzucchelli
authors.forename: R
authors.initials: R
authors.lastname: Kraft
authors.forename: A
authors.initials: A
authors.lastname: Kappeler
authors.forename: J
authors.initials: J
authors.lastname: Laissue
mesh_terms: D000368:Aged; D001707:Biopsy, Needle; D005260:Female; D006411:Hematopoiesis, Extramedullary; D006801:Humans; D055728:Primary Myelofibrosis / Q000175:diagnosis; D013961:Thyroid Gland / Q000473:pathology*; D016606:Thyroid Nodule / Q000473:pathology*