Imagine the horror of constantly needing to use the loo.

This was reality for over 20 years for one man, according to the Daily Mail and the New England Journal of Medicine.

The medical mystery was solved after a CT scan revealed a giant mass pressing on the man's bladder, according to the New England Journal of Medicine (See video below).

Based on a YouTube video by Amazing World, the mass was surgically removed in October 2013 and caused a shock in the medical community when Dr. Rachael Sussman of Georgetown University Hospital and Dr. Jonah Murdock of Washington DC Veteran Affairs Medical Center published an article about the mass.

According to Sussman and Murdock, the "rubbery mass" measured 3.94 by 3.74 by 2.76 inches or 10 x 9.5 x 7.5 centimeters and weighed 220 grams or about half a pound. The mass is described in the journal as "a free-floating, smooth, firm, rubbery mass."

Amazing World explains the findings in the medical journal in plain terms, which define the mass as a "peritoneal loose body." According to Amazing World, peritoneal loose bodies commonly form in the abdomen. However, this was the largest specimen of its kind to ever be reported.

"The mass was likely made of a small piece of fat that fell away from its attachments when the patient was very young. Over time the fat calcified and continued to grow,"  Sussman told the Huffington Post in an email, as reported by Amazing News. "Like a pearl inside an oyster."

Thankfully for the affected man, his symptoms of frequent urination were alleviated immediately after the mass was removed, reported Sussman and Murdock.