Abstract

Background: Idiopathic granulomatous mastitis (IGM) is a chronic inflammatory condition of the mammary gland that presents as a painful mass, and it must be distinguished from both infectious mastitis and breast cancer. When diagnosed during lactation, it can result in significant distress and early weaning. Injection of triamcinolone has been used as a successful treatment method, but safety in breastfed infants has not been established. Methods: We present a case of a lactating patient who received a direct injection of triamcinolone (dosage 40 mg) in her breast to treat IGM after failure of oral corticosteroids. Breastmilk samples were expressed by the patient 0, 1, 4, and 24 hours after the procedure, and then daily for 1 week. All the samples were analyzed using liquid chromatography mass spectrometry. The patient was supported by a breastfeeding and lactation medicine clinic. Results: After injection of triamcinolone into the granulomatous mass, breast milk samples were collected and analyzed. No samples were found to contain triamcinolone. A temporary but significant decrease in milk production was noted after injection, though only a slight decrease had been noted with 6 weeks of systemic corticosteroids. With support, the patient rebuilt milk production and continued to breastfeed from both breasts. Conclusion: Triamcinolone was not found in any milk samples (≥0.78 ng/mL) following therapeutic injection of the affected breast. The patient was able to continue breastfeeding from the affected breast with intermittent symptoms.

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