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Objective:To investigate magnetic resonance imaging (MRI) findings of primary ovarian leiomyoma (POL) and improve the understanding of the disease.Methods:The clinical data of four cases of POL confirmed by surgical pathology who received treatment in Huadu District People's Hospital between September 2006 and August 2018 were retrospectively analyzed. MRI manifestations and pathological features of POL were analyzed.Results:In four cases, POL occurred in unilateral ovarium and appeared to be a single quasi round mass with complete capsule and clear boundary. A solid mass was observed in three cases and a cystic solid mass in one case. Subcapsular effusion was observed in three cases with a relatively large tumor body. Typical MRI findings were iso-intensity or slight hypo-intensity signal on T 1WI, hypo-intensity signal on T 2WI and diffusion-weighted images. The solid part on enhanced scan was enhanced synchronously with the uterus. Atypical T 2WI findings included cystic changes as shown by varying degrees of hyper-intensity signal, and the cystic change area was not enhanced. The internal signal and pathological features of POL were similar to those of uterine leiomyoma. Conclusion:The research results are highly innovative and scientific. MRI is of great significance in the diagnosis and differential diagnosis of POL.
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Objective:To investigate the imaging characteristics of pregnant women complicated with posterior reversible encephalopathy syndrome(PRES), in order to improve the understanding of the disease.Methods:The clinical and imaging data of 17 pregnant patients complicated with PRES from July 2011 to July 2017 of the People′s Hospital of Huadu District in Guangzhou were analyzed retrospectively.Results:All patients were preeclampsia or eclampsia in pregnancy (5 cases with eclampsia, 12 cases with eclampsia). Among them, 8 cases underwent CT examination, 9 cases underwent MRI examination Typical imaging findings were symmetrical subcortical white matter and subcortical cerebral edema presented as irregular low density area on CT images and symmetric subcortical white matter and abnormal cortical signal on MRI fluid-attenuated inversion recovery (FLAIR)images.Diffuse-limited signals were not observed in both DWI and ADC.The location of lesions were parieto-occipital lobes[100.0%(17/17)], followed by frontallobe[88.9%(15/17)], temporal lobe[29.4%(5/17)], basal ganglia[41.2%(7/17)], corpus callosum[17.6%(3/17)], radiant crown[11.8%(2/17)]and cerebellum[11.8%(2/17)]. After symptomatic treatment, the clinical symptoms of all patients were significantly improved after 1-2 weeks, and no clinical symptoms were observed after 1-3 months of follow-up.Conclusion:The characteristic imaging features can be assessed in pregnant patients complicated with PRES, which presented as symmetrical subcortical white matter and subcortical cerebral edema, mainly involved the region supplied by posterior circulation, got good results after treatment timely.
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Objective@#To determine imaging features that may help predict the presence of placenta accreta, placenta increta or placenta percreta on prenatal MRI scanning in order to identify the most diagnostic findings.@*Methods@#The prenatal MRI scan data of placenta accreta, placenta increta or placenta percreta (placenta implantation group, n=15) and normal placenta(placenta normal group, n=15) diagnosed and treated by surgical pathology from January 2010 to December 2017 in the People's Hospital of Huadu District were retrospectively analyzed.Two expert MRI doctors were blinded to the patients' true diagnosis and were asked to score a total of 10 MRI features of the placenta and adjacent structures.The interrater reliability was assessed using kappa statistics.The features with a moderate kappa statistic or better(kappa>0.40 ) were then compared with the true diagnosis for each observer.@*Results@#Eight of the scored features had an interobserver reliability of kappa>0.40: placenta previa(κ=0.89); abnormal uterine bulging(κ=0.57); intraplacental hemorrhage(κ=0.45); the presence of dark intraplacental bands on T2W imaging(κ=0.76); flow-empty blood vessels in placenta(κ=0.67); border on placenta and uterus blurring(κ=0.63); heterogeneity of signal intensity on T2-weighted(T2W) imaging(κ=0.53); and continuity of myometrium was interrupted(κ=0.64). Using Fisher's two-sided exact test, there were statistically significant differences between the proportion of patients with placental invasion and those without placental invasion for three of the features: abnormal uterine bulging(P=0.015, P=0.011); heterogeneity of T2W imaging signal intensity(P=0.006, P=0.013); and presence of dark intraplacental bands on T2W imaging(P=0.032, P=0.010).@*Conclusion@#MRI can be a useful adjunct to ultrasound in diagnosing placenta accreta prenatally.Three features that are seen on MRI in patients with placental invasion appear to be useful for diagnosis: uterine bulging; heterogeneous signal intensity within the placenta; and the presence of dark intraplacental bands on T2W imaging.
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Objective To determine imaging features that may help predict the presence of placenta accreta , placenta increta or placenta percreta on prenatal MRI scanning in order to identify the most diagnostic findings . Methods The prenatal MRI scan data of placenta accreta,placenta increta or placenta percreta (placenta implantation group,n＝15) and normal placenta (placenta normal group,n＝15) diagnosed and treated by surgical pathology from January 2010 to December 2017 in the Peopleˊs Hospital of Huadu District were retrospectively analyzed.Two expert MRI doctors were blinded to the patientsˊtrue diagnosis and were asked to score a total of 10 MRI features of the placenta and adjacent structures.The interrater reliability was assessed using kappa statistics.The features with a moderate kappa statistic or better ( kappa ＞0.40 ) were then compared with the true diagnosis for each observer. Results Eight of the scored features had an interobserver reliability of kappa ＞0.40:placenta previa (κ＝0.89);abnormal uterine bulging(κ＝0.57);intraplacental hemorrhage (κ＝0.45);the presence of dark intraplacental bands on T2 W imaging( κ＝0.76); flow －empty blood vessels in placenta ( κ＝0.67); border on placenta and uterus blurring(κ＝0.63);heterogeneity of signal intensity on T 2 －weighted( T2 W) imaging(κ＝0.53);and continuity of myometrium was interrupted ( κ＝0.64).Using Fisherˊs two －sided exact test, there were statistically significant differences between the proportion of patients with placental invasion and those without placental invasion for three of the features:abnormal uterine bulging ( P＝0.015,P＝0.011);heterogeneity of T2 W imaging signal intensity ( P＝0.006,P＝0.013);and presence of dark intraplacental bands on T 2 W imaging(P＝0.032,P＝0.010).Conclusion MRI can be a useful adjunct to ultrasound in diagnosing placenta accreta prenatally.Three features that are seen on MRI in patients with placental invasion appear to be useful for diagnosis : uterine bulging; heterogeneous signal intensity within the placenta;and the presence of dark intraplacental bands on T 2 W imaging.