Choriocarcinoma is a rare and aggressive type of cancer that primarily arises from the cells that would normally develop into the placenta during pregnancy. It is classified as a gestational trophoblastic disease and can occur after a normal pregnancy, miscarriage, or abortion. This cancer is characterized by the rapid growth of abnormal cells and can spread to other parts of the body, including the lungs and brain. Symptoms of choriocarcinoma may include abnormal bleeding, pelvic pain, and signs of metastasis, depending on where the cancer has spread. Diagnosis typically involves blood tests to measure human chorionic gonadotropin (hCG) levels, imaging studies, and a biopsy. Treatment often includes chemotherapy, which can be effective in managing the disease.