Blood and immunity

• extramedullary hematopoiesis
  20 April 2005

  Images
  Neonatal lung and hepatic extramedullary hematopoiesis https://twitter.com/KUSAURAP/status/749193650370818048
  intratumoral extramedullary hematopoiesis https://twitter.com/DrAldehyde/status/1165345185393516544
  Localization
  pulmonary hematopoiesis
  hepatic hematopoiesis
  cutaneous hematopoiesis
  intratumoral extramedullary hematopoiesis clear cell renal cell carcinoma mammary solitary fibrous tumor
  See also
  hematopoeisis medullary (...)

• thrombocytosis
  15 April 2005

  References
  Schafer AI. Thrombocytosis. N Engl J Med. 2004 Mar 18;350(12):1211-9. PMID: #15028825#

• Birbeck granules
  8 April 2005

  Tennis racket shaped structures found in Langerhan’s cells in histiocytosis X (Langerhan’s cell histiocytosis) which includes eosinophilic granuloma, Letterer-Siwe disease and Hand-Schuller-Christian disease.
  See also
  Langerhans cells
  Langerhans cell histiocytosis

• mastocytes
  7 April 2005

  Mast cells. Adj. mastocytic

• systemic mastocytosis
  7 April 2005

  Images
  6/M urticaria, Darier sign+; Metachromatic staining of granules by Giemsa.
  https://twitter.com/yamahalion/status/767808326553837568
  Mastocytosis of bones : woven bone
  https://twitter.com/RiyamZreikMD/status/857055677633712128
  Subtypes
  c-kit-negative systemic mastocytosis (#11446735#)
  See also
  mastocytoses
  localized mastocytosis
  solitary mastocytoma
  cutaneous mastocytosis
  systemic mastocytosis
  urticaria pigmentosa
  TMEP (telangiectasia macularis eruptiva (...)

• lymphoepithelial lesion
  12 March 2005

  lymphoepithelial lesions
  Images
  https://twitter.com/rawandtajsahib/status/736525670474493952
  Synopsis
  NOT A SPECIFIC FINDING
  Seen in benign circumstances: florid gastritis (Hashimoto’ s, myo/Iymphoepithelial sialadenitis)
  Seen in other lymphomas of B and T-cell type (can be "striking" in thyroid FL)
  NOT A REQUIRED FINDING
  MALT lymphomas can arise at sites without epithelial structures
  Very infrequent in MALT lymphomas in some gastrectomy specimens (cutaneous MALT lymphomas) (...)

• crystal-storing histiocytosis
  7 March 2005

  Associations
  lymphoproliferative diseases, extranodal marginal zone B-cell lymphoma (MALToma) (#12616474#) multiple myeloma low-grade B-cell lymphoma
  fibroleiomyomatous hamartoma (#12616474#)
  Localization
  lungs (#12616474#)

• hemophagocytic lymphohistiocytosis
  22 February 2005

  FHLs, HPLH, HLH, familial erythrophagocytic lymphohistiocytosis, familial hemophagocytic lymphohistiocytosis, familial hemophagocytic lymphohistiocytoses
  Definition: Familial hemophagocytic lymphohistiocytosis (FHL) is a rare, fatal disorder of early infancy.
  Images
  hepatic erythrophagocytosis in hemophagocytic lymphohistiocytosis
  https://twitter.com/GIPathologyURMC/status/889533077118214144
  See also
  erythrophagocytosis
  hepatic erythrophagocytosis
  Hemophagocytic (...)

• myeloid tumors
  31 January 2005

  myeloid proliferations; myeloid neoplasms
  Open references
  Extramedullary Manifestations of Myeloid Neoplasms.
  Wilson CS, Medeiros LJ.
  Am J Clin Pathol. 2015 Aug;144(2):219-39. doi:10.1309/AJCPO58YWIBUBESX.
  PMID: #26185307# (Free)
  References
  Mutations in myeloid neoplasms. Cotta CV, Tubbs RR. Diagn Mol Pathol. 2008 Dec;17(4):191-9. PMID: #18936708#
  Vardiman JW, Harris NL, Brunning RD. The World Health Organization (WHO) classification of the myeloid neoplasms. Blood. 2002 Oct (...)

• leucocytic adhesion
  30 January 2005

  leucocyte adhesion, leukocyte adhesion

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