A Folliculostellate (FS) cell is a type of non-endocrine cell found in the anterior lobe of the pituitary gland.

Pituicytoma is a rare glial sellar/suprasellar neoplasm arising in the neurohypophysis with a possible origin from the folliculostellate cells of the adenohypophysis 1) 2).

1)
Phillips JJ, Misra A, Feuerstein BG, Kunwar S, Tihan T. Pituicytoma: Characterization of a unique neoplasm by histology, immunohistochemistry, ultrastructure, and array-based comparative genomic hybridization. Arch Pathol Lab Med 2010;134:1063-9.
2)
Koutourousiou M, Gardner PA, Kofler JK, Fernandez-Miranda JC, Snyderman CH, Lunsford LD. Rare infundibular tumors: clinical presentation, imaging findings, and the role of endoscopic endonasal surgery in their management. J Neurol Surg B Skull Base. 2013 Feb;74(1):1-11. doi: 10.1055/s-0032-1329619. Epub 2012 Dec 31. PubMed PMID: 24436883; PubMed Central PMCID: PMC3699169.