PRL and hyperprolactinemia: There was no statistically significant difference between premature and clinically appropriate groups for patient sex (p = 0.12) or year of MRI (p = 0.35), but patients in the premature group were significantly older (p < 0.01, mean difference 1.52 years, 95% CI:[0.45,2.49]).<h4>Conclusions</h4>MRI for investigation of mild hyperprolactinemia is often ordered prematurely without confirmation by repeat prolactin level and generates incidental findings of uncertain clinical significance to the presenting issue.