Mammary myofibroblastoma is a rare, benign, circumscribed mesenchymal breast tumor.
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Epidemiology
It is the only breast tumor that occurs more commonly in males than females 2. It also has a tendency to occur more often in elderly males and postmenopausal women.
Pathology
It arises from the stromal spindle cells of the breast 1. It stains positive for immunoreactive markers for desmin, smooth muscle, and actin.
Radiographic features
Mammography
- circumscribed mass
- no calcifications
- greatest diameter no more than 1-4 cm
Ultrasound
It usually has the appearance of a fibroadenoma:
- circumscribed homogenous
- slightly hypoechoic
MRI
- circumscribed mass
- internal septations
- homogenous enhancement
Treatment and prognosis
Complete resection is recommended as it has a high rate of recurrence if not completely excised 3.
Differential diagnosis
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