Speaker: Professor Iype Cherian Format: Select the single best answer.
1. According to the lecture, what was the principal significance of the Cusco Consensus?
A. It recommended decompressive craniectomy for every severe traumatic brain injury
B. It placed cisternostomy alongside decompressive surgery as a treatment option in appropriately trained hands
C. It recommended cisternostomy only for aneurysmal subarachnoid hemorrhage
D. It advised against opening the basal cisterns in trauma
2. Which CT finding was emphasized as an indicator of uncal herniation and the need for urgent surgery?
A. Narrowing of the ipsilateral cerebellopontine angle cistern
B. Enlargement of the fourth ventricle
C. Widening of the ipsilateral cerebellopontine angle cistern
D. Calcification of the basal ganglia
3. According to Professor Cherian, why does the ipsilateral cerebellopontine angle cistern widen during uncal herniation?
A. The uncus pushes the brainstem away from the affected side
B. The fourth ventricle becomes obstructed
C. Cerebellar edema pushes the brainstem forward
D. The tentorium moves toward the temporal lobe
4. What was the primary operative goal of cisternostomy in the severe traumatic brain injury cases presented?
A. Removal of the entire temporal lobe
B. Restoration of cerebrospinal fluid pathways and relaxation of the swollen brain
C. Permanent closure of the basal cisterns
D. Creation of a large cranial defect
5. Which structures were repeatedly identified during opening of the basal cisterns?
A. Optic nerve, internal carotid artery, and basilar artery
B. Facial nerve, sigmoid sinus, and jugular bulb
C. Superior sagittal sinus, falx, and corpus callosum
D. Vein of Galen, straight sinus, and pineal gland
6. Which membrane was opened to gain access toward the interpeduncular and prepontine cisterns?
A. Arachnoid granulation membrane
B. Membrane of Liliequist
C. Tentorial membrane
D. Falx cerebri
7. What did Professor Cherian describe as “unherniation”?
A. Removal of the temporal lobe
B. Lifting the relaxed temporal lobe away from the middle fossa and tentorium after cisternal decompression
C. Replacing the bone flap before opening the cisterns
D. Draining the lateral ventricle through the cortex
8. What change in practice did the speaker describe regarding bone-flap replacement?
A. He changed from routinely replacing the bone flap to permanently removing it
B. He initially left the bone flap out but later favored replacing it after an effective cisternostomy
C. He replaced the bone flap only in patients with aneurysms
D. He stopped performing craniotomy and used burr holes exclusively
9. According to the lecturer’s experience, what was associated with poorer outcomes?
A. Replacing the bone flap after brain relaxation
B. Opening the optico-carotid cistern
C. Leaving the bone flap out after cisternostomy
D. Using microscopic magnification
10. How did the lecturer describe the origin of his cisternostomy concept for trauma?
A. It began during an elective tumor operation
B. It developed after a traumatic lesion was initially mistaken for an aneurysm and treated using vascular microsurgical principles
C. It was derived from endovascular thrombectomy
D. It began with lumbar-drain treatment of hydrocephalus
11. Which surgical disciplines were described as being applied to traumatic brain injury in the development of cisternostomy?
A. Functional and pediatric neurosurgery
B. Spine surgery and peripheral nerve surgery
C. Skull-base and vascular microneurosurgery
D. Radiosurgery and stereotactic biopsy
12. Why did the lecturer discourage beginning by opening the Sylvian fissure in a severely swollen traumatic brain?
A. The Sylvian fissure is usually absent after trauma
B. The fissure may be extremely tight and difficult to open safely before basal cisternal relaxation
C. Opening it always causes hydrocephalus
D. It prevents later replacement of the bone flap
13. Which cisternal corridors were described as useful for initial access?
A. Subfrontal, optico-carotid, and lateral carotid corridors
B. Transcallosal and transventricular corridors
C. Retrosigmoid and far-lateral corridors
D. Interhemispheric and transforniceal corridors
14. What was the lecturer’s usual practice regarding opening of the lamina terminalis during trauma cisternostomy?
A. He opened it in every case
B. He generally did not open it
C. He opened it only after closing the basal cisterns
D. He considered it the first mandatory surgical step
15. What type of catheter did Professor Cherian say he currently uses for cisternal drainage?
A. Foley catheter
B. Feeding tube only
C. External ventricular drainage catheter
D. Lumbar-peritoneal shunt catheter
16. Approximately how far was the catheter described as being advanced into the prepontine cistern?
A. Less than 1 millimeter
B. Approximately 1–2 centimeters
C. Approximately 5–7 centimeters
D. Into the fourth ventricle
17. When was the cisternal drainage catheter generally removed according to the lecture?
A. At the end of the operation
B. After approximately 24 hours
C. After approximately five days
D. After six weeks
18. Which serious intraoperative complication was reported from the lecturer’s experience?
A. Injury at the internal carotid–anterior cerebral artery junction associated with excessive retraction
B. Complete transection of the basilar artery during every operation
C. Routine postoperative spinal cord infarction
D. Persistent air embolism caused by the microscope
19. Which structures require particular protection during skull-base dissection for cisternostomy?
A. Internal carotid artery, A1 segment, perforators, and optic nerve
B. Superior sagittal sinus and torcular only
C. Facial nerve and cochlea only
D. Vertebral artery and cervical spinal cord only
20. What training pathway did Professor Cherian propose for a surgeon learning cisternostomy?
A. Observation of one online video without laboratory training
B. Five laboratory dissections followed by several supervised clinical cases
C. Fifty decompressive craniectomies without skull-base dissection
D. Endovascular training alone
Author: desertedbeach
