[Bilateral erythematous swelling of the breasts in a pregnant patient]. / Bilaterale erythematöse Schwellungen der Mammae bei einer schwangeren Patientin.

Mastitis is an infectious or noninfectious inflammation of the mammary glands. The most important differential diagnosis of mastitis is an inflammatory carcinoma, which can be excluded by imaging and a biopsy. Noninfectious mastitis can also occur during pregnancy and knowledge of the possible differential diagnoses is essential for appropriate diagnostics and treatment.