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A case study was published in the Journal of Medical Case Reports of a man suffering with a varicocele.
The 54-year-old man had a left-sided varicocele and was also suffering with lower abdominal pain and a decrease in urination.
Four months previously, he had noticed pain and swelling in his left groin and had been diagnosed with left-sided varicocele.
His blood tests revealed severe kidney injury.
“Varicoceles could be an early presentation of a non-functioning adrenocortical carcinoma,” said the study.
It added: “Acute kidney injury can occur as a result of mass effect or thrombosis of renal vessels.
“Large tumours can cause abdominal pain as a late manifestation.