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1. A condition marked by an accumulation of neuroglia cells around the neurons of the central nervous system; often as a prelude to neuronophagia.

2. The presence of satellite, smaller structures, or lesions, e.g., metastic melanoma in the skin adjacent to the primary tumour, or lymphocytes in contact with a damaged keratinocyte in acute cutaneous graft versus host reaction.

Origin: L. Satelles (satellit-), an attendant, _ G. -osis, condition