What is your differential when PIP (peak inspiratory pressure) is HIGH and your plat (plateau pressure) is HIGH?
Alveoli cannot fill:
Pulmonary edema (fluid, blood)
Pneumonia
ARDS
Alveoli cannot expand:
Pneumothorax/Hemothorax
Pleural effusions
Abdominal compartment syndrome
(Not an extensive differential! But gives you some common examples.)