Pineal parenchymal tumor (PPT) outcomes according to revised histology. (A, B) For all patients regardless of tumor grade, gross total resection (GTR) is associated with improved disease control (P = .04) and improved overall survival (P = .04) by Fisher exact test when compared with subtotal resection and biopsy (sub-GTR). (C, D) For patients with PPTs of indeterminate differentiation (PPTIDs), small-cell morphology is associated with improved overall survival (P = .02) and a trend toward improved progression-free survival (P = .07) by log-rank test.