Schrader valves, seen on mountain bikes, kidsâ bikes and all types of casual riding bikes, are the same valve type you will see on automobile tires. The valve body is shorter than that of a Presta, and the depressible pin sits inside the valve stem rather than on top of it.
Papilledema refers to swelling of the optic disc from increased intracranial pressure (ICP)]. It must be distinguished from optic disc swelling from other causes which is simply termed optic disc edema. Papilledema must also be distinguished from pseudo-papilledema such as optic disc drusen. Since the root cause of papilledema is increased intracranial pressure (ICP) this is an alarming sign which may presage such entities as brain tumor, CNS inflammation, or idiopathic intracranial hypertension (IIH). Etiology
What are the most frequent causes of papilledema? The most common causes of papilledema are: tumor of the brain, spinal cord, skull, spinal column, or optic nerve, abscess, craniosynostosis, hemorrhage, hydrocephalus, intracrâ¦anial infection, head injury. Emily Koehler.