Fig. 2

Histological and immunochemical characteristics. Serial sections from case 3 (a) showing a papillary architecture (H&E) with a GFAP positive glial component overlaying hyalinized vessels, synaptophysin positive interpapillary regions, absence of chromogranin positive cells but a CD34 extravascular expression. Serial sections from case 5 (b) showing a perivascular architecture and ganglion cells (H&E) with a GFAP positive glial component overlaying hyalinized vessels, synaptophysin positive interpapillary regions, with numerous chromogranin positive ganglion cells but an absence of CD34 extravascular expression. 2A, 2B GFAP, synaptophysin, CD34 magnification x100, 2B H&E, chromogranin magnification x200