By Sam Blanchard Senior Health Reporter For Mailonline
Published: 11:03 BST, 23 July 2019 | Updated: 11:03 BST, 23 July 2019
A trans man who had his penis constructed from skin from his forearm developed stony growths in his urethra.
Doctors said the condition the 22-year-old developed was 'rare' and that they didn't know how to treat it.
The stones, which were blocking the patient from going to the toilet properly, had to be dissolved using a laser.
In a case report the medics said using flesh from the forearm to construct a penis for trans men is the 'gold standard' but very often causes complications.
Doctors in Portugal released photos of the urethra before (left) and after (right) they used a laser to destroy the stones. Pictured middle, during the laser treatment
Doctors from a university hospital in the city of Coimbra, Portugal – about 80miles (128km) south of Porto – revealed the case in a medical journal.
They diagnosed the man, who had transitioned from female to male in 2014, with urethral lithiasis.
Urethral lithiasis is the formation of salt-like stones in the urethra – the tube through which urine is carried along the penis.
These are similar to kidney stones, which are a common condition and are believed to affect more than one in 10 people.
However, the doctors said in the journal BMJ Case Reports that it was rare to see the condition after sex change surgery, so they had to improvise a treatment.
They said the man's urethra had become narrowed