In retrospect, the signal changes and anatomic findings can be explained by the results from the pathology analysis; the grossly enlarged tubular structure posterior to the right ovary and closely related to the cecal pole, containing heterogeneous signal, is the hemorrhagic appendix with changes of endometriosis within. Perforation has occurred as shown by the pockets with air-fluid levels. 

This study also demonstrates the utility of MRI for post-operative assessment in pregnancy in order to reduce the radiation burden imposed by CT. The follow up study shows a large abscess in the right lower quadrant as well as several smaller collections in the deep pelvis. The large abscess compresses the right ureter against the right psoas muscle, mimicking the physiologic hydronephrosis of pregnancy usually caused by the gravid uterus causing this compression.