{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,23]],"date-time":"2026-08-23T16:12:38Z","timestamp":1787501558432,"version":"build-2736575974"},"reference-count":34,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[1983,12]]},"abstract":"<jats:p content-type=\"fine-print\">\u2713 Choroid plexus papillomas and mature human choroid plexus were studied by light and electron microscopic techniques. The mature choroid plexus has three types of cells: Type I cells are cuboidal or columnar cells and line the villi; Type II cells are flat cells lining connective tissue adjacent to neural tissue; and Type III cells are flat cells lining crypts in connective tissue. The cells of benign papillomas were similar to the fully developed Type I cells. The cells of a malignant papilloma were similar to the underdeveloped-appearing Type III cells. 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