1. This led to the resection of the manometrically diagnosed abnormal colon, which was found to be aganglionic.

2. In contrast to freeze-drying of tissue blocks the freeze-drying of cryostat sections can be controlled manometrically.

3. With his pressure studies of the colon, Swenson first recognized Hirschsprung’s disease for what it was. This led to the resection of the manometrically diagnosed abnormal colon, which was found to be aganglionic.