Mastitis

Causes

Appropriate Tests

Infectious

Nipple discharge, MCS pus when infection is thought to be present.

Staphylococcus aureus is the most likely pathogen, especially during lactation.

  • Acute bacterial

 

  • Tuberculous

Pus, biopsy specimen - Mycobacteria testing.

Non-infectious

 

  • Periductal mastitis/duct ectasia

 

  • Lobular granulomatous mastitis

 

  • Inflammatory carcinoma

Breast carcinoma can present as an acute inflammatory process and mimic acute infection: Fine needle aspiration biopsy, Breast biopsy, if inflammation is unresponsive to treatment.

See Breast lesion