Male primary mediastinal choriocarcinoma with diffuse metastases: A case report.

Rationale: Choriocarcinoma is a rare and highly invasive gestational trophoblastic tumor that secretes high levels of human chorionic gonadotropin (hCG). As one of the uncommon non-gestational choriocarcinoma, primary mediastinal choriocarcinoma is an exceeding rare, and aggressive malignancy with poor prognosis.

Patient Concerns: A 26-year-old man was admitted to the hospital with cough, shortness of breath, and occasional hemoptysis.

Diagnoses And Intervention: Imaging examinations revealed a large mediastinal mass, diffuse nodular opacities with blurred edges in both lungs, and multiple brain lesions. Laboratory tests showed an astonishing increase of serum β-hCG. A diagnosis of primary mediastinal choriocarcinoma with advanced lung and brain metastases was finally made after 3 biopsies and immunohistochemical analyses. Surgery and radiotherapy were not applicable at the time of diagnosis, and both targeted therapy and immunotherapy were unavailable. During the first 4 cycles of trophoblastic tumor-based chemotherapy, the patient improved clinically with fewer symptoms, decreased β-hCG and reduced lesions. However, drug resistance quickly emerged, forcing an alternative chemotherapy regimen that also failed.

Outcomes: The patient finally endured symptoms including headache, dizziness and vomiting, and subsequently succumbed after an overall survival time of six and half months.

Lessons: Male primary choriocarcinoma is an extremely rare type of malignancy. Greater awareness, earlier diagnosis and novel treatments are urgently needed to benefit patients.