Fig. 5

Papillary tumor of the breast. A well-bordered complex cystic mass with the solid portion (star) restricting diffusion. The lesion shows three different appearances of hemorrhage. Appearances of hemorrhagic contents of the tumor depend on several factors. The content located at dependent part (curved arrow) is T1 and T2 hyperintense, and may be superimposed by the susceptibility artifacts due to degradation products and being very hypointense on both DW-MRI and ADC map. The hemorrhagic contents located at the central part of the lesion (arrow) restricts diffusion because bright on DW-MRI and dark on ADC map. This can be due to intact red blood cell membranes with intracellular oxyhemoglobin, deoxyhemoglobin, or methemoglobin and clot retraction. Lastly, the content marked black arrowhead shows no restriction can be explained by disintegration products of the bleeding and more chronic stages