Posterior pituitary lobe: The rear-facing lobe of the ... shaped depression in the middle of the sphenoid bone called the sella turcica. This butterfly-shaped, unpaired bone is located ...

Production of radionecrosis in a major portion of the pituitary ... of the sella turcica, so that 75 to 90 per cent of the anterior lobe will be destroyed by radionecrosis, sparing the posterior ...