Segmental testicular infarction is an uncommon condition, of which the majority of cases are idiopathic. Cases associated with atherosclerotic disease are extremely rare, with only two other cases reported in the literature to our knowledge. We report the case of a 71-year-old man who presented with left testicular pain and a mass. Ultrasound imaging confirmed an upper pole left testicular mass, and he subsequently underwent radical inguinal orchidectomy for presumed testicular malignancy. Histological analysis revealed a segmental testicular infarction related to arterial atheroma. Segmental testicular infarction can mimic other pathologies, such as testicular torsion or cancer, resulting in misdiagnosis and potentially unnecessary surgery. Increased awareness of the risk factors and clinical features may help clinicians identify and appropriately manage this uncommon pathology.