A garage attendant in Italy accidentally rammed a 300,000 ($A580,000) Ferrari into a shop front after mistaking the accelerator for the brake.The attendant was supposed to be delivering the rare supercar, which can accelerate from a standing start to 60mph in three seconds, to its owners, a Dutch couple who had taken part in a meeting of Ferrari enthusiasts in Anzio, south of Rome, the UK'sDaily Telegraphreports.The owners were staying just a few streets away from where the car was being stored.Instead of gently guiding the bright red Ferrari 599 GTO towards the Hotel Exedra, a mortified Roberto Cinti careered into a shop, trashing the car completely and badly damaging the shop front."I got confused instead of the brake, I pressed down on the accelerator," he told police who were first on the scene, according to Corriere della Sera.He was lightly injured and in a state of shock after the accident and received treatment in hospital.Powered by a V-12 engine, the Ferrari 599 GTO has a top speed of more than 200mph.The identity of the Dutch owner has not been revealed and his reaction to what happened is not known.The matter is being investigated by an insurance company.However, a laparoscopy located a "free-floating, smooth, firm, rubbery mass", which measured 10 by 9.5 centimetres and weighed 200 grams.The lump looks remarkably like a boiled egg and, when it was removed, the man said he did not feel the need to make a trip to the loo as often as he had in the previous two decades."The findings were consistent with a peritoneal loose body, a formation that is thought to result from torsed, infarcted, and detached epiploic appendages that transform into fibrotic masses," US doctors Rachael Sussman and Jonah Murdock reported in the journal."Such masses are often asymptomatic when they are small, but they can be large enough to cause extrinsic compression that is associated with bowel obstruction, urinary retention, or [as in this patient] urinary frequency."The journal said in another report that any lump larger than five centimetres wide was rare, with very few cases reported in medical history.