Oncology firm Elekta's Leksell Gamma Knife received a mention in Guinness World Records for halting the growth of the world's tallest human.
The company's Leksell Gamma Knife assisted in the radiosurgery of 29-year-old Sultan Kosen to stop his growth at the height of 8 ft, 3 inches.
Kosen suffers from the effects of acromegaly, and he has held the title of World's Tallest Living Human since September 2009.
Beginning at age 10, a tumor in Kosen's brain secreted enormous amounts of growth hormone, and the Gamma Knife radiosurgery offered the opportunity to improve his acromegaly. The technology delivered low-intensity radiation beams to Kosen's tumor.
The procedure was performed at the University of Virginia Medical Center by Dr. Jason Sheehan.
![A 53-year-old patient (patient number four) with a recurrent pituitary adenoma with extension of a cystic component of disease to the medial temporal lobe apparent on MRI (contoured in blue), and extension of disease to the left sphenoid bone and orbital apex apparent on [68Ga]Ga-DOTA-TATE (contoured in yellow).](https://img.auntminnie.com/mindful/smg/workspaces/default/uploads/2026/04/pituitary-tumor.QGsEnyB4bU.jpg?auto=format%2Ccompress&fit=crop&h=100&q=70&w=100)
![A 53-year-old patient (patient number four) with a recurrent pituitary adenoma with extension of a cystic component of disease to the medial temporal lobe apparent on MRI (contoured in blue), and extension of disease to the left sphenoid bone and orbital apex apparent on [68Ga]Ga-DOTA-TATE (contoured in yellow).](https://img.auntminnie.com/mindful/smg/workspaces/default/uploads/2026/04/pituitary-tumor.QGsEnyB4bU.jpg?auto=format%2Ccompress&dpr=2&fit=crop&h=167&q=70&w=250)
