MRI Case 22

40 y/o F presents for diagnostic MRI to evaluate a benign left breast mass. What is the most likely diagnosis?


  • Benign stromal overgrowth; possibly hormonally-driven
  • Women of reproductive age
  • Mammo: Circumscribed mass or focal asymmetry without calcifications
  • US: Hypoechoic or slightly heterogeneous mass
  • MRI: Nonspecific, but may present as clumped NME with persistent/plateau kinetics
  • Can grow over time; NOT associated with malignancy

Related Radiology Article: Jones KN, Glazebrook KN, Reynolds C. Pseudoangiomatous stromal hyperplasia: imaging findings with pathologic and clinical correlation. American Journal of Roentgenology. 2010 Oct;195(4):1036-42.