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. 2014 Dec 5;12:374. doi: 10.1186/1477-7819-12-374

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© Gachechiladze et al.; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Biopsy specimen from primitive neuroectodermal tumor (PNET) of the lung. (a) Areas of highly cellular neoplastic tissue (H&E, magnification × 40), (b) discohesive growth of small, blue, round to oval cells, characteristic of pulmonary PNET (H&E, magnification × 200). (c) Characteristic scant, basophilic cytoplasm, ovoid or polygonal nuclei, fine granular chromatin texture and marked nucleoli. Some nuclei were hyperchromatic. H&E, magnification × 400. d) CD99 membranous expression, characteristic of PNET (magnification × 100). and expression of (e) CD56 (magnification × 100) and (f) vimentin (magnification × 100). (g, h) Fluorescent in situ hybridization of EWSR1 gene: fusion signals: yellow or red/green double spot indicates intact EWSR1, separate green and red signals indicate translocation. Magnification (g) × 600, (h) × 1000).