Review Question - QID 213486

A 1-day-old boy is brought to the emergency department by ambulance after his parents found him to be increasingly lethargic. He was born at home with inconsistent prenatal care. Since then, his parents report that his head appears to be getting bigger over the past few hours. He also feeds poorly and has had a few episodes of vomiting. On presentation, he is found to have limb spasticity with adducted thumbs. His head circumference is bigger than expected and he appears to be unable to look up when following objects. Which of the following findings would most likely also be seen in this patient?