keen's point keen's point keen's point is one of the ventriculostomy sites used in neurosurgery, typically in pediatrics for ventriculoperitoneal shunt placement. keen's point is located 3 cm superior and 3 cm posterior to the helix of the ear. a burr hole or small twist drill hole is made in the skull at the keen's point, to introduce a catheter into the lateral ventricle of brain for the purpose of obtaining or diverting cerebrospinal fluid. the procedure is done for both diagnostic and therapeutic purposes.