¥I Figure 4 Photomicrographs of a meningioma diagnosed in an exposed Utirik woman (No. 2249). (a) and (b) represent low- and high-powerviews, respectively, of typical meningioma histology, whereas (c) and (d) show atypical areas with increased mitoses, nuclear pleomorphism, and hypercellularity. [Reviewed at the Armed Forces Institute of Pathology, Washington, DC (Dr. J.A. Gutierrez).]