病理学家依据组织学确诊胚胎滋养层疾病。图示葡萄胎有典型的滋养层增生，但绒毛仍然存在。追踪观察病人HCG水平。
The pathologist determines the histologic diagnosis of the trophoblastic disease, most importantly, if choriocarcinoma is present. In this hydatidiform mole there is atypical trophoblastic proliferation, but villi are still present. The patient is then followed with serial HCG levels.