A 62-year-old man, who told doctors that for 20 years he had a frequent urge to urinate, was found to have a giant lump in his stomach that resembled a large boiled egg.

The lump was found to have been pressing on his bladder, which gave him the sensation of having to go to the toilet.

The lump, which resembles a boiled egg, found inside the patient's stomach. Credit:The New England Journal of Medicine

The New England Journal of Medicine reported in its latest edition that the physical examination and laboratory findings were described as "unremarkable".

However, a laparoscopy located a "free-floating, smooth, firm, rubbery mass", which measured 10 by 9.5 centimetres and weighed 200 grams.