Abnormal rise of HCG in a female of reproductive age group may indicate the following malignancy:
**Core Concept**
Ectopic pregnancy and certain types of trophoblastic disease can cause abnormal elevations in human chorionic gonadotropin (hCG) levels in females of reproductive age. hCG is a hormone produced by the placenta during pregnancy, and its levels typically rise and fall in a predictable manner. However, in cases of ectopic pregnancy or gestational trophoblastic disease, hCG levels may become elevated and persist despite the absence of a viable intrauterine pregnancy.
**Why the Correct Answer is Right**
Gestational trophoblastic disease (GTD) encompasses a range of conditions, including hydatidiform mole, invasive mole, choriocarcinoma, and placental site trophoblastic tumor. These conditions arise from the trophoblastic cells that normally form the placenta during pregnancy. In GTD, the abnormal trophoblastic cells can produce hCG in excess, leading to elevated levels in the blood. Choriocarcinoma is a type of GTD that can produce high levels of hCG, often exceeding 100,000 mIU/mL.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the abnormal rise of hCG in females of reproductive age. While ovarian cancer can produce hCG, it is not the most common cause of elevated hCG levels in this demographic.
* **Option B:** Ovarian cancer can produce hCG, but it is not the most likely cause of abnormal hCG elevations in females of reproductive age. Ovarian cancer typically presents with symptoms such as abdominal pain and ascites, rather than abnormal hCG levels.
* **Option C:** This option is not relevant to the abnormal rise of hCG in females of reproductive age. While pituitary tumors can produce hCG, they are not the most common cause of elevated hCG levels in this demographic.
**Clinical Pearl / High-Yield Fact**
Gestational trophoblastic disease can present with a wide range of symptoms, including vaginal bleeding, abdominal pain, and elevated hCG levels. A high index of suspicion is necessary to diagnose GTD, as it can mimic other conditions such as ectopic pregnancy and ovarian cancer.
**Correct Answer: C. Choriocarcinoma.**