Editing Appendicitis (section)

====Magnetic resonance imaging====
[[Magnetic resonance imaging]] (MRI) use has become increasingly common for diagnosis of appendicitis in children and pregnant patients due to the radiation dosage that, while of nearly negligible risk in healthy adults, can be harmful to children or the developing baby.<ref>{{Cite journal |last1=D'Souza |first1=Nigel |last2=Hicks |first2=Georgina |last3=Beable |first3=Richard |last4=Higginson |first4=Antony |last5=Rud |first5=Bo |date=2021-12-14 |editor-last=Cochrane Colorectal Group |title=Magnetic resonance imaging (MRI) for diagnosis of acute appendicitis |journal=Cochrane Database of Systematic Reviews |language=en |volume=2021 |issue=12 |pages=CD012028 |doi=10.1002/14651858.CD012028.pub2 |pmc=8670723 |pmid=34905621}}</ref> In pregnancy, it is more useful during the second and third trimester, particularly as the enlargening uterus displaces the appendix, making it difficult to find by ultrasound. The periappendiceal stranding that is reflected on CT by fat stranding on MRI appears as an increased fluid signal on T2 weighted sequences. First-trimester pregnancies are usually not candidates for MRI, as the fetus is still undergoing [[organogenesis]], and there are no long-term studies to date regarding its potential risks or side effects.<ref>{{cite journal | vauthors = Burke LM, Bashir MR, Miller FH, Siegelman ES, Brown M, Alobaidy M, Jaffe TA, Hussain SM, Palmer SL, Garon BL, Oto A, Reinhold C, Ascher SM, Demulder DK, Thomas S, Best S, Borer J, Zhao K, Pinel-Giroux F, De Oliveira I, Resende D, Semelka RC | title = Magnetic resonance imaging of acute appendicitis in pregnancy: a 5-year multi-institutional study | journal = American Journal of Obstetrics and Gynecology | volume = 213 | issue = 5 | pages = 693.e1–6 | date = November 2015 | pmid = 26215327 | doi = 10.1016/j.ajog.2015.07.026 }}</ref>