my grandfather's problem? i am writing this letter on behalf of my father.my grandfather is suffering from
 a severe problem from about 1&half month.his pain starts from his thigh and goes
towads the the tip of his foot.his problem is so severe that he cannot even walk 
from 1 room 2 the other.his age is around 70.on the doctor's advice we had taken
for an MRI scan.the report we got back goes like this.
MRI LUMBO-SACRAL SPINE
MRI of lumbosacral spine was done using T1&T2weighted saggital & axial imaging.
axial imaging was done through intervertebal discs.intervertebal discs are 
dessicated.ther is progressive caudal narrowing of lumber canalis seen suggestive
of element of developmental lumbar canal stenosis.diffuse disc bulge with bilateral
facetal arthropathy is seen atL3-4 level causing mild thecal-sac compression.diffuse 
disc bulge with broad based posterior disc herniation,bilateral facetal arthropathy
& lingamantum flavum hypertrophy is seen at L4-5 level causing moderate
circumferential compression of thecal-sac & lateral recsss stenosis.there is
 compression of both L-5 nerve roots.diffuse disc bulge with small sized right 
para-central disc herniation is seen at L5-S1 level causing mild compression of 
S1 nerve root.th vertebrae show degenerative changes & osteophytes.pre &
paravertebral soft tissues r normal.CSF shows normal signal intensity.lower chord
shows normal signal intensity & morphology.
IMPRESSION-combined degenerative & developmental lumber canal stenosis 
from L3-4 2 L5-S1 level,mild at L3-4 & L5-S1 levels & severe at L4-5 level.
through the net i kindly request all the people who r reading this to send in their
replies if they know anything about thi problem.

Summarized question: What is lumbar canal stenosis?