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Vol. 113, No. 4, 2005
Issue release date: June 2005
Section title: Original Paper
Acta Haematol 2005;113:213–219
(DOI:10.1159/000084673)

Initial (Latent) Polycythemia vera with Thrombocytosis Mimicking Essential Thrombocythemia

Thiele J. · Kvasnicka H.M. · Diehl V.
aInstitute of Pathology and bFirst Clinic of Internal Medicine, University of Cologne, Cologne, Germany

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 10/7/2004
Accepted: 10/25/2004
Published online: 6/10/2005

Number of Print Pages: 7
Number of Figures: 2
Number of Tables: 3

ISSN: 0001-5792 (Print)
eISSN: 1421-9662 (Online)

For additional information: http://www.karger.com/AHA

Abstract

Patients have previously been described who showed clinical signs and symptoms suggesting essential thrombocythemia (ET), but later transformed to polycythemia vera (PV). From a series of 344 patients with a sustained borderline to moderate erythrocytosis, 44 failed to conform initially with the diagnostic criteria of the WHO for PV, because of their low hemoglobin level. Twenty-three patients of this group presented with a thrombocytosis exceeding 600 × 109/l and therefore suggested ET, but later developed full-blown PV. For comparison we investigated also 164 patients with manifest PV, 90 patients with ET and 22 patients with reactive thrombocytosis (Th). The histopathology of initial PV was evaluated by stepwise discriminant analysis of 17 standardized features. Quantity and left shifting of erythro- and granulopoiesis, giant forms and naked nuclei of megakaryocytes, cellularity and reticulin fibers proved to exert a significant relevance concerning differentiation from true ET and Th. In conclusion, initial PV with thrombocytosis is characterized by a special pattern of BM histopathology. Therefore, so-called masked PV in patients with ET or simultaneous PVR-1 gene expression and endogeneous erythroid colony growth in ET patients are probably in keeping with initial PV mimicking ET.


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 10/7/2004
Accepted: 10/25/2004
Published online: 6/10/2005

Number of Print Pages: 7
Number of Figures: 2
Number of Tables: 3

ISSN: 0001-5792 (Print)
eISSN: 1421-9662 (Online)

For additional information: http://www.karger.com/AHA


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