Bone marrow - nonneoplastic
Alterations in cellularity
Amegakaryocytic thrombocytopenia

Author: Dragos Luca, M.D. (see Authors page)

Revised: 7 July 2017, last major update March 2013

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PubMed Search: Bone marrow amegakaryocytic thrombocytopenia

Cite this page: Amegakaryocytic thrombocytopenia. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/bonemarrowamegakaryocyticthrombocytopenia.html. Accessed July 20th, 2017.
Definition / general
  • Also called CAMT (congenital amegakaryocytic thrombocytopenia)
  • Extremely rare, usually diagnosed in early childhood (Pediatr Blood Cancer 2011;57:199, Hematol Oncol Clin North Am 2009;23:321)
  • Initially thought to have variable inheritance (autosomal recessive or X linked) but X linked forms now reinterpreted as mild or attenuated forms of Wiskott-Aldrich syndrome
Etiology
Clinical features and diagnosis
  • Isolated nonimmune thrombocytopenia with decreased marrow megakaryocytes and high serum TPO levels
  • Red cell macrocytosis with normal hemoglobin level
  • Bone marrow initially normocellular
  • Mucocutaneous or GI bleeding, variable physical abnormalities (Br J Haematol 2005;131:636)
Case reports
Treatment and prognosis
  • Stem cell transplantation
  • 50% evolve to aplastic anemia (at mean age 3.5 years); may evolve to myelodysplastic syndrome or leukemia
Microscopic (histologic) images

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Bone marrow aspiration and trephine biopsy

Cytology images

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Bone marrow failure in child