The clinical manifestations of pontine hemorrhage include sudden headache, vomiting, dizziness, diplopia, lateral gaze palsy, crossed paralysis or hemiplegia, quadriplegia, etc.
When the amount of bleeding is small, the patient is conscious and may present with some typical syndromes such as the locked - in syndrome.
In cases of massive bleeding (more than 5 milliliters), the hematoma involves both the basal and tegmental parts of the pons bilaterally. The patient quickly enters a state of impaired consciousness, presenting with pinpoint pupils, quadriplegia, respiratory disorders, decerebrate rigidity, stress ulcers, central hyperthermia, etc., and often dies within 48 hours.