Fig. 1

Interstitial pregnancy. Initial interpretation of magnetic resonance images revealed heterogenous hypersignal structure within the lower segment of the uterus that seemed to invade the cervical stroma () which erroneously was diagnosed as lower uterine/cervical mass; however, surgical findings confirmed that this was abnormally adherent invasive placenta of interstitial pregnancy. Retrospective re-evaluations of MRI were as follows: Sagittal (A, B) T2-weighted HASTE MR images showing intramural myoma (*) within the posterior wall of the uterus. Note that the endometrial cavity is completely empty (arrow). Coronal (C, D) T2-weighted HASTE MR images (obtained more cranial than A, B at the level of abdominal cavity) show eccentrically located fetus with overlying thin myometrium. Relationship of pregnancy and utero-tubal junction or the interstitial portion of fallopian tubes was imprecise as a result of the fetus size. The patient underwent successful termination via C-section and the finding at surgery confirmed the interstitial pregnancy