CSF Flow Quantification of the Cerebral Aqueduct in Normal ...
X:VIMSUPDATES 6AprilNew IAP UG Teacing Module … · NORMAL CSF PATHWAY 3. 4 NORMAL CSF PATHWAY....
Transcript of X:VIMSUPDATES 6AprilNew IAP UG Teacing Module … · NORMAL CSF PATHWAY 3. 4 NORMAL CSF PATHWAY....
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HYDROCEPHALUS
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NORMAL CSF PATHWAY
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NORMAL CSF PATHWAY
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HYDROCEPHALUS
• Increased ventricular size due to increase in volume of CSF due to either– Increased production– Obstruction– Impaired absorption
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HYDROCEPHALUS
1. Obstructive type/non communicating– Obstruction in ventricular system
2. Non obstructive/communicating – Obliteration of subarachnoid cisterns or
decreased absorption
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CAUSES
– OBSTRUCTIVE TYPE• CONGENITAL
– Aqueductal stenosis, – Arnold Chiari malformation, – Dandy walker malformation – Spina bifida– Vein of Galen aneurysm
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CAUSES
• OBSTRUCTIVE TYPE– SPACE OCCUPYING LESION
• Intra‐ventricular tumor, • Posterior fossa tumor
– VENTRICULAR HEMORRHAGE• Prematurity• AV malformation
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CAUSES
• COMMUNICATING TYPE– DEFECTS IN SUBAROCHNOID SPACE
• Infections–Congenital–Meningitis (Pyogenic or tubercular)
• Hemorrhage–Subarachnoid–Trauma
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CAUSES
• COMMUNICATING TYPE
– ABNORMALITIES OF THE CSF• Overproduction – Choroid plexus papilloma
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CAUSES
• COMMUNICATING TYPE
– DEFECT OF CSF ABSORPTION• Congenital deficiency of Arachnoid Granulation
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PATHOPHYSIOLOGY
Obstruction to CSF flow
Reversal of ventricular fluid into periventricular white matter
Demyelination and progressive gliosis
Damage to periventricular white matter and later gray matter
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CLINICAL FEATURES
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• Increased Head Circumference at Birth.
• Rapidly increasing head size
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CLINICAL FEATURES
• Neonates and infants• Irritability• Poor appetite, • Vomiting• Poor head control• Sun Setting sign• Tense fontanelle, Delayed fusion of sutures
• Dilated scalp veins• Macewans or crack pot sign positive (>1 yr of age)
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CLINICAL FEATURES
• Older children– Sign S/S raised ICT
• Headache, worst in the morning• Nausea and vomiting• Papilledema• Blurred vision• Drowsiness/depressed level of consciousness
• Personality and behavioral disturbances• Gait abnormalities
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• Serial HC measurement/HC more than 2 std.
deviation
• Papilledema
• Abducens palsy
• Pyramidal tract lesions ( lower extremities )
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CLINICAL FEATURES
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1. TYPE ‐ I
2. TYPE ‐ II
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ARNOLD CHIARI MALFORMATION
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ARNOLD CHIARI MALFORMATION
TYPE – I
• Not associated with Hydrocephalus
• Seen in adolescence
• Headache, Neck pain
• Progressive spasticity
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ARNOLD CHIARI MALFORMATION
TYPE – II
• LESION‐ failure of pontine flexure in
embryogenesis
• Elongation of 4th ventricle /kinking of brain stem
• Displacement of medulla, pons, vermis‐ cervical
canal
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ARNOLD CHIARI MALFORMATION II
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ARNOLD CHIARI MALFORMATION
TYPE ‐ II ( CL. FEATURES )
INFANCY
• weak cry
• stridor
• apnea
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ARNOLD CHIARI MALFORMATION
TYPE ‐ II ( CL. FEATURES )
• Progressive hydrocephalus• Myelo‐meningocele
• Abnormality of gait
• Spasticity
• Incoordination
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• Failure of development of roof of 4th ventricle
• Cerebellar hypoplasia
• Cystic dilatation of 4th ventricle
• Ass. Anomalies‐ absence of corpus callosum
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DANDY WALKER MALFORMATION
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DANDY WALKER MALFORMATION
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DANDY WALKER MALFORMATION
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DANDY WALKER MALFORMATION
Clinical features• Increasing head size
• Prominent occiput
• Cerebellar ataxia
• Delayed motor & cognitive development
• Trans‐illumination
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TRANSILLUMINATION
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DIAGNOSIS OF HYDROCEPHALUS
Increased velocity of head growth
< 15 months – Neurosonogram (Cranial
ultrasonogram )
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‐ Separated sutures ‐ Silver beaten appearance ‐ Shallow orbit
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X‐RAY SKULL
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CT SCAN/MRI – DILATED VENTRICLES
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CT SCAN/MRI – DILATED VENTRICLES
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CT SCAN/MRI – DILATED VENTRICLES
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CT SCAN/MRI – DILATED VENTRICLES
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TREATMENT
• MEDICAL– Reduction of CSF production
• Acetazolamide 50mg/kg/day
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TREATMENT
• SURGICAL– Reconstruction within cranium– Diversion of CSF to extra cranial sites using shunts
• Ventricular atrial• Ventriculo azygous• Ventriculo peritoneal• Theco peritoneal
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VENTRICULOPERITONEAL SHUNT
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VENTRICULOPERITONEAL SHUNT
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VENTRICULOPERITONEAL SHUNT
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VENTRICULOPERITONEAL SHUNT
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VENTRICULOATRIAL SHUNT
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THECOPERITONEAL SHUNT
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POST SHUNT SURGERY
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1) Chabra’s
2) Pudenz – Hakin
3) Splitz – Holter valve
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TYPES OF VP SHUNT
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SPLITZ HOLTER VALVE
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TREATMENT
1) Ventriculostomy
• Opening of ventricular system into subarachnoid space via lamina terminalis.
2) Treatment of cause :
• TB meningitis – ATT
• Pyogenic Meningitis ‐ Antibiotics
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COMPLICATIONS OF VP SHUNT
• Blockage
• Infection
• Shunt dependence
• Slit Ventricle Syndrome
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COMPLICATIONS OF VP SHUNT
• Migration of tube
• Intestinal obstruction
• Peritonitis
• Arrhythmias
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D/D OF LARGE HEAD
• Chronic Anemia SECONDARY• Rickets TO THICKENED• Osteogenesis Imperfecta CALVARIUM• Epiphyseal Dysplasia• Chronic Subdural Collection• Metabolic Disorders• Cerebral Gigantism• Familial Megalencephaly • Hydrancephaly
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Thank You
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