Grand Rounds

Unilateral breast mass in a newborn

Centro Hospitalar Tâmega e Sousa, Portugal

Address for Correspondence: Sofia Pimenta, Avenida do Hospital Padre Américo 210, 4564-007 Penafiel, Portugal

Keywords: unilateral breast mass, neonatal mastitis

Clinical Problem :
A female full-term newborn, with 26 days of age, was brought to the Emergency Department for edema and right nipple redness with a 2-day evolution; the mother reported discomfort since that day. Pregnancy and delivery were uneventful. No fever, nipple exudate or associated skin lesions were reported.
On physical examination, nipple swelling was observed on the right with associated erythema and no apparent fluctuation (Figure 1). The remaining physical exam was normal. The laboratory tests results were unremarkable and the peripheral blood culture was sterile.

Figure 1. Right breast with edema and redness on admission to the Emergency Department.

What is the diagnosis?
What is the diagnosis?
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