Figure 5b. Endometritis secondary to methicillin-resistant Staphylococcus aureus in a 31-year-old woman. Three weeks after cesarean section, the patient experienced septic shock. (a) Sagittal T2-weighted image shows the incision site for cesarean section in the anterior uterine wall (arrow). The uterus is enlarged with overall high signal intensity. The air (arrowhead) resulted from sanitization of the endometrial cavity. (b) Sagittal contrast material-enhanced T1-weighted image shows intense enhancement of the uterus with particularly prominent cervical enhancement (arrowheads). The cervix does not usually enhance so intensely unless it is significantly inflamed. The fluid seen in the endometrial cavity was found to be pus. (c) Sagittal T2-weighted image obtained 4 months after resolution of the endometritis shows decreased size of the uterus. The uterine position has changed from retroflexion to anteflexion. The zonal anatomy and the signal intensity of the myometrium have returned to normal. The diagnosis was confirmed with cultures of pus, which were positive for methicillin-resistant S aureus.