Microscopic images.A, Proliferation of spindle cells oriented in intersecting fascicles or haphazardly distributed, accompanied by numerous plasma cells.

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Microscopic images.A, Proliferation of spindle cells oriented in intersecting fascicles or haphazardly distributed, accompanied by numerous plasma cells and small lymphocytes (original magnification, ×200).B, Myofibroblasts show minimal nuclear pleomorphism... Microscopic images.A, Proliferation of spindle cells oriented in intersecting fascicles or haphazardly distributed, accompanied by numerous plasma cells and small lymphocytes (original magnification, ×200).B, Myofibroblasts show minimal nuclear pleomorphism (original magnification, ×1000)‏ Roberto Gasparotti et al. AJNR Am J Neuroradiol 2003;24:2092-2096 ©2003 by American Society of Neuroradiology