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SUMMARY:Forty-eight surgically removed pituitary adenomas have been investigated hy electron microscopy. Distinct differences in fine structural appearances permitted their separation into 5 classes: 1) Growth hormone, (GH)-cell tumors; 2) Prolactin cell tumors; 3) Mixed adenomas composed of GH and prolactin cell's; 4) Adrenocorticotrophic-Melanocyte stimulating hormone (ACTH-MSH) cell tumors; 5) Undifferentiated cell adenomas. Densely and sparsely granulated tumors were distinguished withindoi:10.1017/s0317167100025944 fatcat:iosf3fvklrajbp7v4pkg4zxvwa