Symmastia is a condition defined as a confluence of the breast tissue of both breasts across the intermammary cleft that normally divides them. It can be surgically corrected by a plastic surgeon through symmastia revision.[1]

Symmastia can either be a congenital anomaly or iatrogenic.[2] Congenital symmastia is a rare condition with few published cases. Iatrogenic symmastia may occur following breast augmentation, forming what is also colloquially referred to as a "uniboob" or "breadloafing" as a result of the release of skin and muscle tissue around the sternum due to over-dissection.[3]


  1. ^ Wong, M. T.; Cheong, E. C.; Lim, J.; Lim, T. C. (2007). "Creation of an intermammary sulcus in congenital synmastia". Singapore Medical Journal. 48 (1): e29–e31. PMID 17245502.
  2. ^ Sillesen, N. H.; Hölmich, L. R.; Siersen, H. E.; Bonde, C. (2012). "Congenital symmastia revisited". Journal of Plastic, Reconstructive & Aesthetic Surgery. 65 (12): 1607–13. doi:10.1016/j.bjps.2012.08.008. PMID 23026472.
  3. ^ "Symmastia".