Final answer:
Ductography is the procedure of cannulating the lactiferous duct and injecting contrast agent to visualize it for evaluation and identification of abnormalities or blockages.
Step-by-step explanation:
The procedure described in the question is called ductography. It involves cannulating the lactiferous duct and injecting a small amount of contrast agent to visualize the duct and surrounding structures. Ductography is commonly used to evaluate nipple discharge and identify any abnormalities or blockages in the duct.