A cerebellar neoplasm of an 18-month-old boy was examined with both the light and electron microscopes. The diagnosis of neuroblastoma was made on the basis of the presence of numerous synaptic vesicles in the great majority of cell processes and the occasional complete synapses within the tumor tissue.
Key words Cerebellum - Medulloblastoma - Neuroblastoma - Synapses - Synaptic vesicles