الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 82 |  |  |
| | | from | 82 | | |
Abstract
The placenta is an organ that develops in the uterus during pregnancy. The life of the fetus depends upon the welfare of the placenta and the life of placenta depends upon the welfare of the mother to whom it is so intimately attached.
Placenta accreta is a condition of abnormal placental implantation in which the placental tissue invades beyond the decidua basalis. It may invade into or even through the myometrium and adjacent organs, such as the urinary bladder. The incidence has been rising in recent years. It is one of the important obstetric complications nowadays, leading to significant maternal morbidity and mortality.
Imaging of the placenta can have a profound impact on patient management. It should be performed with minimal risk to both the mother and developing fetus.
As a result, noninvasive techniques such as ultrasonography (US) and magnetic resonance (MR) imaging that do not use ionizing radiation are preferred. Sonography remains the first imaging modality for evaluation of the placenta. Magnetic resonance (MR) imaging has many unique properties that make it well suited for imaging of the placenta: the multiplanar capabilities, the improved tissue contrast that can be obtained using a variety of pulse sequences and parameters and the lack of ionizing radiation.
The purpose of this study was to high lighten the role of magnetic resonance imaging (MRI) in detecting abnormal placentation.
Breath-hold T2-weighted half-Fourier rapid acquisition with relaxation enhancement (RARE) imaging in the three orthogonal planes is the key MRI technique. Markedly heterogeneous placenta, thick intraplacental dark bands and focal uterine bulge are the cardinal MRI features of PA.
Our study included thirty three pregnant females with high risk of placenta accreta (21 proved to have placenta accreta with abnormal placentation. They were subjected to Magnetic resonance imaging after being suspicious by US examination. The sensitivity and specificity of MRI were 100% and 83% respectively in its ability to diagnose abnormal placentation.
While it has low sensitivity in defining level of placenta accreta (71.4%) while it has relatively higher sensitivity in defining level of placenta increta (83.3%)
Conculsion
Magnetic resonance imaging hand in hand with ultrasound is important for the accurate diagnosis of abnormal placentation. Co-operation of both modalities may provide more diagnostic information. Inclusion of MR imaging in the routine evaluation of patients with high risk for abnormal placentation may reduce hospital stays and unnecessary interventions with favorable outcome.