Duke hails incredible surgeons.
William visited the Royal Marsden in Chelsea, west London, where he viewed sections of a breast reconstruction procedure and the removal of a bladder tumour involving two patients.
He was following in the footsteps of his mother, Diana, Princess of Wales, after she watched a heart operation at Harefield Hospital in Middlesex in 1996.
The Duke witnessed the operations in the hospital's Wolfson Surgical Suite where he was introduced to the teams led by surgeons, Stuart James and Pardeep Kumar.
Dressed in medical scrubs and wearing a mask, he viewed a breast reconstruction procedure for a female patient in her 60s and the removal of a male patient's bladder tumour.
The Duke of Cambridge, right, watches as lead surgeon Pardeep Kumar, left, performs surgery for the removal of a bladder tumour on a patient