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Fig. 3C. —Appendiceal phlegmon in 29-year-old woman at 27 weeks' gestation. MRI was performed to document size of phlegmon because surgeons preferred to treat patient with antibiotics if phlegmon was sizeable. Axial fat-saturated half-Fourier single-shot fast spin-echo image (single shot/62; flip angle, 130°; matrix, 192 x 256; field of view, 30 cm; and slice thickness, 6 mm) shows markedly enlarged appendix 2 cm in diameter (arrowheads) surrounded by inflammatory phlegmon. Patient was treated with IV antibiotics. Follow-up MR image (not shown) obtained 5 weeks later showed no change. Cesarean delivery was performed at 33 weeks' gestation, and appendectomy performed at delivery confirmed appendicitis.