Systemic mastocytosis associated with acute myeloid leukemia: case report and implications for disease pathogenesis  Luis Escribano, MD, PhD, Andrés Garcı́a-Montero,

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Systemic mastocytosis associated with acute myeloid leukemia: case report and implications for disease pathogenesis  Luis Escribano, MD, PhD, Andrés Garcı́a-Montero, PhD, Rosa Núñez-López, MD, Javier López-Jiménez, MD, PhD, Julia Almeida, MD, PhD, Aranzazu Prados, BSc, Alberto Orfao, MD, PhD  Journal of Allergy and Clinical Immunology  Volume 114, Issue 1, Pages 28-33 (July 2004) DOI: 10.1016/j.jaci.2004.02.042

Fig 1 A, May-Grünwald Giemsa-stained BM smear at diagnosis showing a massive infiltration by myeloid blast cells and an abnormal MC (arrow) with spindle shape, cytoplasmic prolongations, and oval nucleus. B, Toluidine blue staining revealed a dense compact aggregate of spindle-shaped MCs in a BM particle. Journal of Allergy and Clinical Immunology 2004 114, 28-33DOI: (10.1016/j.jaci.2004.02.042)

Fig 1 A, May-Grünwald Giemsa-stained BM smear at diagnosis showing a massive infiltration by myeloid blast cells and an abnormal MC (arrow) with spindle shape, cytoplasmic prolongations, and oval nucleus. B, Toluidine blue staining revealed a dense compact aggregate of spindle-shaped MCs in a BM particle. Journal of Allergy and Clinical Immunology 2004 114, 28-33DOI: (10.1016/j.jaci.2004.02.042)

Fig 2 Representative immunophenotypic characteristics of myeloid blast cells and MCs coexisting in the patient's BM. A-H, Myeloblasts. Note the presence of a small population of blast cells showing an immature (CD34+/CD45+) phenotype, suggesting commitment toward the MC lineage (CD117+++, tryptase-positive, FcεRI−/+, CD25−/+; blue dots) in contrast with a major population of non-MC CD34++ leukemic blast cells (red dots). I-L, CD117+++, selectively gated BM MCs from the same patient. In these panels, black dots correspond to CD25++, CD2+ aberrant mast cells and violet events to normal mast cells. APC, Allophycocyanine; ctryptase, cytoplasmic tryptase; FITC, fluorescein isothiocyanate; PE, phycoerythrin; PerCP, peridin chlorophyll protein. Journal of Allergy and Clinical Immunology 2004 114, 28-33DOI: (10.1016/j.jaci.2004.02.042)