| empty sella s. |
a syndrome diagnosed radiologically in which the diaphragma sellae is vestigial and the enlarged sella turcica forms an extension of the subarachnoid space and is filled with cerebrospinal fluid. The pituitary fossa appears empty, although the pituitary gland is present in a flattened form; pituitary hormone secretion may be normal, deficient, or excessive. Sometimes there is downward herniation of the optic chiasm, which leads to defects in the visual field.
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