[A rare observation of the giant urinary bladder stone].

A rare observation of iatrogenic damage of the urinary bladder by the needles used for osteosynthesis, which were encrusted with salts and lead to the formation of a giant bladder stone weighing 720 g, is given. The curiosity of the situation was associated with the long-term observation and the surgical removal of the stone and foreign bodies 19 years after initial detection due to the development of upper urinary tract complications.