Inm-1: Indication of First Trimester Sonongraphy

Improvement in ultrasound technology, including transvaginalsonography and higher frequency probes, has led to a better understanding of early pregnancy development. The first trimester ultrasound have been identified that can be used to reassure women that their pregnancy is progressing normally or abnormal them that their pregnancy will fail. The practicing radiologist and obstetrician must be familiar with basic embryology and sonography of the first trimester to interpret studies accurately and counsel women about the status of their early pregnancies. Sonographic appearance depends on the stage of development and size of size of the conceptus. Therefore,sonographic examination should be relevant to developmental stage. Most examinations are needed for vaginal bleeding or pelvic pain, or a palpable mass which has revealed in physical exam. The primary goals of early first trimester sonography examination are as follows: 1. Site of implantation (intrauterine pregnancy or ectopic), 2. shape and size of gestational sac, 3. Presence of yolk sac and embryo, 4. Presence of cardiac activity, 5. Assessment of gestational age, 6. presence and size of sub-chorionic hematoma, 7. Assessment of uterine or adnexal masses and 8. Detection of embryonic fetal anomalies.