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Washington University Experience | NEOPLASM (SELLAR) | Pituitary Adenoma - Pituitary Neuroendocrine Neoplasm | Somatotroph | 4C3 PA, sparse granulation (Case 4) CK 4.jpg
These spherical perinuclear cytoplasmic inclusions are positive for pan-cytokeratin, consistent with "fibrous bodies." ---- Not Shown: Ki67 stains a small proportion of tumor cell nuclei, ranging focally up to 1%. ---- Comment: These histomorphological laboratory findings and immunohistochemical features demonstrated that this tumor is a sparsely granulated somatotroph adenoma.
