Yes , Sinwar had a brain abscess whilst in Israel jail for murdering four people .
Israeli doctors operated on him and saved his life .
Sinwar then was released in a prisoner exchange and then went on to organise the Oct 7 th terror attack on Israel .
The Isreali Doctor who diagnosed Sinwars brain tumour and saved his life , his nephew was killed in the Oct 7 attack
He saved the life of Hamas’s leader. Then they murdered his nephew
Bitton spent years working as a dentist in Israel’s Nafha Prison. It was there he met “the person” – "Yahya Sinwar, a Hamas militant convicted of murder who would go on to become the group’s leader in Gaza – saying he saved his life by helping diagnose a brain tumor."
"Bitton said his nephew, Tamir, was “seriously injured” trying to fight off the attackers.
“There were only five of them, they didn’t really stand a chance, and he was kidnapped while he was still seriously injured, unconscious, and died after a few hours in Gaza.”
https://edition.cnn.com/2024/06/20/middleeast/israeli-dentist-hamas-yahya-sinwar-intl/index.html