A 24-year-old male presented in 2014 with left sided abdominal pain and a palpable abdominal mass. After appropriate investigation a diagnosis of an extra-gonadal germ cell tumour was made and he was treated with platinum based chemotherapy. He then underwent retroperitoneal lymph node dissection due to residual disease identified on imaging with no specific tissue type identified on the histological sample. In early 2019 he presented to his General Practitioner with a left sided testicular lump and was diagnosed with non-seminomatous germ cell tumour of the testis, an uncommon condition; metachronous testicular tumour.
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