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Medulloblastomas usually develop from cerebellar vermis, and from the apex of the 4th ventricle ceiling (fastigium). They are seen as a pale gray-pink, easily disintegrating spherical mass with no well-circumscribed capsule, filling the 4th ventricle. Medulloblastomas are characterized by a large number of small, round, and blue cells with intense hyperchromatic nuclei, small cytoplasm. Homer Wright rosettes showing neurobehavioral differentiation are seen and mitosis is frequen
https://medcraveonline.com/medcrave.org/index.php/JACCOA/art...

the capsule had broken in some places and parenchyma was disintegrating. The removed mass was pale pink, solid, and clearly demarcated - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5121561/

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