Electron microscopy of lymphocytic leukaemia cells in the cerebrospinal fluid.

The ultrastructure of cells in the CSF are reported in 2 cases of lymphocytic leukaemia of the CNS. Unusual nuclear pockets, margination of the nuclear chromatin and fragmentation of the nuclei were frequent in the first case, whereas in the second nuclear pockets were rare and deep indentations of the nuclei frequent.