Unilateral gestational gigantomastia in the third trimester

Gestational gigantomastia is a sudden and rapidly developing unilateral or bilateral excessive breast enlargement during pregnancy. In this case report, we aimed to present a 27-year-old female patient who presented with the complaint of unilateral breast enlargement while she was 7 months pregnant in her second pregnancy and diagnosed with gestational gigantomastia, with clinical and treatment features. Since it is very rare, it may cause difficulties for clinicians in differential diagnosis. Although clinical and examination features suggest malignant or inflammatory processes, it is easy to exclude with radiological imaging methods. Medical or surgical treatment methods should be applied before delivery, as they may cause both psychological and physical deterioration, breast pain, or life-threatening complications such as ulceration-hematoma in the breast for the patient. Malignant and inflammatory processes should be ruled out in the case of rapidly developing breast enlargement during pregnancy, and medical or surgical treatment options should be performed based on the patient's preferences and the gestational week.