A 51-year-old man with no significant medical history was referred to our institution for further management of a palpable, painless right breast lump, which had gradually increased in size for a period of six months. There had also been intermittent discharge from the right nipple for a period of two years. The discharge was bloody at onset but subsequently became clear.Physical examination revealed a firm right breast lump with no clinical evidence of skin involvement or axillary lymphadenopathy. At the time of physical examination, the right nipple discharge was observed to be non-bloody.Mammography (Fig. 1a) and breast ultrasonography (Figs. 1b & c) were performed. What do these images demonstrate? What is the level of suspicion for malignancy?

The name of the last author should read "Llewellyn Shao-Jen Sim".