Gestational choriocarcinoma with renal and pulmonary metastases lacking a primary uterine origin.

OBJECTIVE: We describe a case of gestational choriocarcinoma metastasized to the kidney and lung, which presented initially as refractory hematuria after a term pregnancy 5 years earlier.

CASE REPORT: A 35-year-old woman, G2P1, with a previous history of full-term pregnancy in 2009, presented to the emergency department complaining of intermittent gross hematuria for 2 months. Abdominal computed tomography showed a suspicious arteriovenous malformation in the right kidney and a thrombus within the right renal vein. Transarterial embolization was performed twice to treat the refractory hematuria but was unsuccessful, and radical nephrectomy of the right kidney was performed. The diagnosis was gestational metastatic choriocarcinoma of the kidney based on morphological, immunohistochemical, and DNA studies. Lung metastases were found by computed tomography of the chest. Pelvic ultrasound was performed but showed no primary tumor in the uterine cavity. After surgical intervention, adjuvant chemotherapy involving first single-agent chemotherapy with methotrexate followed by multiagent chemotherapy (EMACO regimen) failed.

CONCLUSION: In women of reproductive age, unexplained hematuria should raise concerns about possible choriocarcinoma, either metastatic gestational or primary nongestational choriocarcinoma of the kidney.