What is the most likely diagnosis based on CT findings?

A 52 year old patient comes to the emergency room with fever, right lower quadrant pain and nausea and vomiting x 3 days. Her urine Pregnancy test is negative. What is the most likely diagnosis based on CT findings?

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A. Acute Appendicits
B. Ectopic Pregnancy
C. Psoas Abscess
D. Pyelonephritis
E. Right Ureteral Stone