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Washington University Experience | BASIC PROCESSES | Meningothelial hyperplasia | 1A3 Arachnoidal cap cell hyperplasia (Case 1) 3 PR
The area shown in images #1A1,2 stains strongly for progesterone receptor, as expected in a case of meningeal hyperplasia but not of normal arachnoidal cap cell clusters caught up in the hemorrhage (PR IHC).
