What should you know about malignant seminoma?

Seminoma is a germ-cell tumour, most often arising in a testicle, although germ-cell tumours can occur elsewhere. Malignant cells may grow locally or spread through lymphatic pathways. Doctors use examination, blood tests, scans, and tissue assessment to identify the tumour and map its extent. Staging helps distinguish disease confined to its starting area from disease involving lymph nodes or other sites.

The diagnosis can feel overwhelming, but the care team can separate decisions into manageable steps: confirming the tumour, preserving health and fertility where possible, choosing treatment, and arranging surveillance. Treatment choices depend on stage, tumour features, general health, and personal priorities.

Discuss tumour removal surgery and ask how the operation affects the affected testicle, fertility, hormone production, and the option of storing sperm before treatment. Depending on the stage and risk features, the team may recommend careful surveillance, chemotherapy, or another planned approach. Chemotherapy uses medicines that circulate through the body; the team will explain possible effects on blood counts, infection risk, nerves, hearing, kidneys, and fertility. Keep follow-up appointments even when you feel well, because monitoring is part of the treatment plan.

Seek prompt medical assessment for sudden severe testicular pain, rapid swelling, fever during treatment, repeated vomiting, reduced urine, chest pain, or new breathlessness. Sudden testicular pain is an emergency because twisting of the testicle can damage its blood supply, whether or not cancer is present. During chemotherapy, contact the treatment team immediately about fever or signs of infection rather than waiting for the next appointment.

Ask: Where is the seminoma and what is its stage? Do I need surgery, surveillance, or chemotherapy? Should sperm be stored before treatment? How will follow-up scans and blood tests be scheduled? Which symptoms during treatment require an urgent call?