What is the upper expanded region of the ureter called?

Name: What is the upper expanded region of the ureter called?
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Renal pyramids are the conical masses that make up the inner region of the kidney, the renal medulla. Each renal pyramid has an apical border called renal papilla. The outermost region of the kidney is the cortex.
You may use the diagram below as a visual reference for the structure of the kidney.
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What Is the Upper Expanded Region of the Ureter Called