What anatomy is indicated by the blue arrow?

What is this image?  What is indicated by the yellow circle?

What position/view of which exam is shown in the image above?

What anatomy is indicated by circle in the image?

What is this image?  What is the blue arrow indicating?

EX# is 1800.  Is this image perfect?  Should you repeat?

DI# 2.0  Is this image perfect?  Should you repeat?

S# is 400.  Is this image perfect?  Should you repeat?

DI #-2.0  Is this image perfect?  Should you repeat?

DI# is 2.0  Is this image perfect?  Should you repeat?