histological analysis of 90 spontaneous primary tumours of the brain observed among 8960 ageing rats ( sprague-dawley-derived ) revealed 55 granular-cell meningiomas , 19 neoplastic reticuloses , 11 neuroglial tumours , 4 pineal tumours , and one pleomorphic , meningeal sarcoma .
C0006118
of
C0031941
pineal tumours