Final answer:
The answer to the question regarding the diagnosis of Gestational Trophoblastic Disease (GTD) is 'fetal pole,' as complete GTD will not have a fetal pole. Ultrasound and hCG levels are used in the diagnosis of GTD, and abnormal placental tissue characterizes the disease.
Step-by-step explanation:
The question you're asking relates to the diagnosis of Gestational Trophoblastic Disease (GTD), a group of pregnancy-related tumors. The correct answer to your question is c) Fetal pole. In complete GTD, specifically a complete hydatidiform mole, there will not be a fetal pole, while in an incomplete mole (partial hydatidiform mole), there can be an abnormal fetus or fetal parts such as grapes (cystic vesicles) and a snowstorm pattern seen on ultrasound due to the edematous chorionic villi. For GTD diagnosis, the presence of human chorionic gonadotropin (hCG) is assessed as its levels are typically elevated. Diagnosis of GTD can involve ultrasound findings in addition to measuring levels of hCG. On an ultrasound, a complete mole will not show a gestational sac, yolk sac, or fetal pole, while an incomplete mole might display a gestational sac with abnormal fetal development. The placenta can appear unusually large with a 'snowstorm' appearance. Other methods of diagnosis may include histopathological examination of the evacuated molar tissue. The placenta, yolk sac, and amniotic sac are crucial in providing nutrition and waste management for a developing fetus. However, in cases of GTD, the placental tissue becomes the main concern as it transforms into an abnormal mass of cysts. Placenta previa is a separate condition where the placement of the placenta can cause complications in pregnancy. Placentation is the process of placenta formation, typically completed by weeks 14-16 of pregnancy.