You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Most common site of metastasis of choriocarcinoma is: and explain in detail?
FIGO- staging of gestational trophoblastic disease: Stage 1 - disease confined to uterus Stage 2 - disease extending outside the uterus but confined to genital structures (adnexa, vagina, broad ligaments) Stage 3 - disease extending to the lung, with or without known genital tract involvement Stage 4 - disease at other metastatic sites most common site of metastasis of choriocarcinoma is lung and is classified as stage 3