ABSTRACT
Patchy or isolated gross lesions of the placenta can be categorized as those primarily resulting from disturbances of maternal blood flow to or within the placenta and those primarily resulting from disturbances of fetal blood flow to the placenta (Table 6). It should be noted that many of the lesions addressed in this chapter and in Chapter 9 on ‘Histologic lesions of the placenta exist in the normal placenta (Table 7). Those abnormalities that affect the placental disk as a whole, or are more likely to show a more extensive involvement, such as maternal floor infarction/massive perivillous fibrinoid deposition, are dealt with in Chapter 10.
