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| The circumscribed mass lesion present here in the sella turcica is a pituitary adenoma. Though pituitary adenomas are benign, they can produce problems either from a mass effect (usually visual problems from pressing on the optic chiasm and/or headaches) or from production of hormones such as prolactin or ACTH. |
| The microscopic appearance of the pituitary adenoma is shown here. Note the monotonous appearance of these small round cells. |
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