FIGURE 3. (A) A skull X-ray shows that the pressure control cam (black arrow) is detached from the base plate and displaced distally. Note the empty X-shaped slit (white arrow) on the base plate. (B) Another skull X-ray of a normal valve with pressure setting at 10 mmH2O is also provided for comparison. Note the correct location of the cam (black arrow) on the X-ray.
