The dilated,proximal portion of the ureter is labeled with an arrow.What is the name of this anatomy shown in the image from an IVU below? 
Definitions:
Motion
The action or process of moving or being moved, involving change in position or location.
Planes
Flat, two-dimensional surfaces that extend infinitely, or a reference to different levels or areas of thought, existence, or development.
Proximity
The physical or psychological closeness between people, objects, or ideas, which can influence their interaction and relationship.
Grouping
The cognitive process of organizing objects or thoughts into groups based on common attributes, which is fundamental to perception and pattern recognition.
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