Gross pathology of the placenta: weight, shape, size, colour.

The gross examination is critical to making accurate diagnoses on placental specimens. An orderly evaluation of the cord, membranes and villous tissue allows maximal opportunity to recognise abnormalities. Many lesions have a pathognomonic gross appearance, while other processes are best seen on histology. Quantitation of the volume of placental tissue involved in an abnormal process is necessary to distinguish normal variation from significant pathology. Histological sections must include cord, membranes and central villous tissue.