The world of sumo could be rocked this month if Prime Minister Sanae Takaichi presents a trophy in the ring, where women have traditionally been banned.

AFP looks at the ancient sport, at previous attempts by women to challenge the taboo, and at why the situation is so delicately poised.

- What is the issue? -

Sumo grew out of ancient Shinto religious rituals and its origins can be traced back over 2,000 years, according to some historians.

The practice of banning women from the ring stems from the Shinto notion that menstrual blood would defile its "purity".

The champion wrestler at each of the six professional sumo tournaments held annually is presented with a large silver trophy called the Prime Minister's Cup.

The trophy is usually presented by a member of Japan's cabinet, but oc

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