Definition: A rare gliogenous neoplasm derived from pituicytes, occurring in the posterior lobe of the pituitary gland and characterized by cells with relatively small, round or oval nuclei and long branching processes that form a complex network of cytoplasmic material, in which numerous small droplets of fat may be demonstrated.
[pituicyte + G. -oma, tumor]
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Examples: glitazone, GI cocktail, etc.