PRL and hyperprolactinemia: Assessments revealed marked hyperprolactinemia (mean serum prolactin concentration, 3902 ng/mL [SI: 169.8 nmol/L]) (reference range, 5.0-30.0 ng/mL [SI: 0.22-1.30 nmol/L]), and an invasive 47 × 43 × 50 mm adenoma extending into the right temporal lobe.