Testicular germ cell tumours (GCTs) account for the majority of testicular malignancies. Seminomas and nonseminomas differ in prognosis and management strategies. While cisplatin-based chemotherapy has significantly improved survival rates, identification of residual masses after chemotherapy is crucial for determining further treatment and survival. For seminomas, spontaneous resolution of residual masses occurs in a significant percentage of cases. Fluorodeoxyglucose positron emission tomography (FDG PET) is recommended for evaluation of residual masses after chemotherapy. Retroperitoneal lymph node dissection (RPLND) offers therapeutic benefits but is challenging because of an increase in desmoplasia after chemotherapy. For nonseminomas, residual masses are common after chemotherapy, with surgical resection necessary for masses larger than 1 cm. FDG PET has limited utility, and timely surgical intervention is crucial for favourable outcomes. Teratoma, if left unresected, can lead to serious complications, including growing teratoma syndrome, malignant transformation, and late relapse. Extraretroperitoneal residual masses, particularly those containing teratoma, are associated with poorer prognosis. Surgical resection remains the mainstay treatment, with significantly higher progression-free and recurrence-free survival rates for fibrosis/necrosis in comparison to teratoma or viable cancer. Understanding the characteristics and management of residual masses after chemotherapy is paramount for optimising treatment strategies and improving patient outcomes in testicular GCT. PATIENT SUMMARY: We reviewed treatment options for patients with testicular cancer who still have tumour tissue in the lower abdomen after chemotherapy. Surgical removal of the tumour is the main option; removal of lymph nodes can also help, but may be difficult because of tissue reactions to chemotherapy. Survival rates differ according to the tumour type and are lower for tumours beyond the lower abdomen.
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