Mammary-Type Myofibroblastoma

Mammary-Type Myofibroblastoma

Cyril Fisher, MD, DSc, FRCPath

Hematoxylin & eosin shows a cellular spindle cell proliferation incorporating subcutaneous fat image.

Hematoxylin & eosin shows short uniform spindle cells arranged in fascicles and cords, infiltrating between collagen bundles.



  • Mammary myofibroblastoma

  • Extramammary myofibroblastoma


  • Benign spindle cell lesion of modified smooth muscle cells in fibrous and fatty stroma

  • Originally described in breast

  • Also occurs in soft tissue locations including in “milkline”

    • Subcutis

      • Inguinal region most common

Jul 9, 2016 | Posted by in PATHOLOGY & LABORATORY MEDICINE | Comments Off on Mammary-Type Myofibroblastoma
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