A 28-year-old primigravida presents with painless vaginal bleeding and severe nausea at 12 weeks gestation. Transvaginal ultrasound reveals a uterus enlarged for dates with a characteristic "snowstorm" appearance and no identifiable fetal pole. The structure marked **A** in the diagram shows the hydropic, grape-like chorionic villi typical of this condition. Bilateral ovarian cysts are also noted. Which of the following statements best characterizes the chromosomal composition and malignant potential of this lesion?
A 22-year-old primigravida presents with painless vaginal bleeding and severe hyperemesis gravidarum at 12 weeks gestation. Ultrasound shows a uterus enlarged beyond dates with the characteristic appearance marked **A** in the diagram — grape-like vesicles without a fetal pole. β-hCG is 185,000 mIU/mL. Bilateral ovarian cysts are noted. After suction evacuation and curettage, which of the following is the MOST critical component of post-evacuation surveillance to detect progression to choriocarcinoma?
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