Choriocarcinoma commonly metastasises to :
**Core Concept**
Choriocarcinoma is a highly aggressive and malignant form of gestational trophoblastic disease (GTD), characterized by the uncontrolled proliferation of trophoblastic cells. This type of cancer often arises from the placental tissue and can metastasize to various organs due to its high vascularity and ability to invade the bloodstream.
**Why the Correct Answer is Right**
Choriocarcinoma commonly metastasizes to the lungs, brain, and vagina due to its rich blood supply and the presence of a high concentration of choriocarcinoma cells in these areas. The lungs are the most common site of metastasis, followed by the brain and vagina. This is because the cancer cells can easily enter the bloodstream and be carried to these organs, where they can establish new tumors.
**Why Each Wrong Option is Incorrect**
**Option A:** Liver - While choriocarcinoma can metastasize to the liver, it is not the most common site of metastasis. The liver is not as richly supplied with blood as the lungs, making it a less likely site for metastasis.
**Option B:** Kidneys - Choriocarcinoma is not commonly known to metastasize to the kidneys. The kidneys are not a typical site of metastasis for this type of cancer.
**Option C:** Bone - While choriocarcinoma can metastasize to the bone marrow, it is not a common site of metastasis compared to the lungs, brain, and vagina.
**Clinical Pearl / High-Yield Fact**
Choriocarcinoma is a highly treatable form of cancer, especially if diagnosed early. However, it can be a challenging disease to manage, and patients often require a multidisciplinary approach involving medical oncologists, radiation oncologists, and obstetricians.
**Correct Answer: B. Lungs**