PTGDS and meningioma: PTGDS expression has been associated with meningioma development [9], and PTGDS fusions were more common in Merlin-intact meningiomas (n = 29 of 104 meningiomas, 27.9%) compared to Immune-enriched meningiomas (n = 13 of 105 meningiomas, 11.3%) or Hypermitotic meningiomas (n = 11 of 83 meningiomas, 13.3%, p = 0.0037, Fischer’s exact test).