What is the pathology and clinical features of Mastitis?

a) Breast engorgement/Swollen breast

b) Blocked duct

c) Non-infectious mastitis

d) Infectious mastitis

e) Breast abscess

a) Breast engorgement/Swollen breast:

In swollen breast, the breast is overfilled with milk leading to block in milk flow leading to increase in pressure inside the milk ducts due to which the breasts appear edematous (swollen) leading to engorgement of the entire breast.
Fever appears and subsidies in 24 hours.