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After yet another disappointing World Cup quarter-final exit in 2023, the side's brains trust resisted the urge to make sweeping changes to their panel and were rewarded with another Six Nations title.

Colloid cysts typically form in a fluid-filled cavity in the centre of the brain, and are themselves filled with fluid, the Brains Trust says.

A benign tumour is not cancerous, but such cysts tend to grow slowly, according to the Brains Trust charity.

Jacques Nienaber, Rassie Erasmus, Mzwandile Stick - a long-standing coaching brains trust - take the credit for that.

It is a brains trust of coaches who have been on the biggest stages and biggest games and know how to manage the build-up.