[Intraligamentary amyloid deposits in spinal canal stenosis].
OBJECTIVE
We have searched for amyloid substance in 41 consecutive samples of tissue taken during laminectomies performed to relieve spinal canal stenoses. We also evaluated the relation between the occurrence of deposits and the age of patients.


METHODS
Tissue sections were stained with Congo red; positive areas had to show green dichroism under polarized light.


RESULTS
Small amyloid deposits were found in fibrous and fibro-elastic (ligamentum flavum) tissues in 14 subjects (34%). After age 60, the frequency was close to 50%. It reached 58% in those aged 70 or over. Our 3 patients aged 80 or more all had deposits. There was also a relation between age and importance of the infiltration. Both sexes appeared evenly involved. Systemic amyloidosis (multiple myeloma) was demonstrated in a single patient. In this case infiltration was slightly more abundant and exceeded ligamentary structures, also involving vascular walls.


CONCLUSIONS
Small amyloid deposits were frequent in our material. Their presence and their abundance were closely related to the age of patients. Rarely, a more important infiltration, exceeding ligamentary structures will perhaps suggest a systemic form of amyloidosis. A few other rare amyloid conditions (amyloidosis associated with prolonged dialysis, amyloid tumour) have been reported to induce spinal canal stenosis. The occurrence of amyloid in vertebral ligaments of non-stenosed elderly persons is not documented; it may represent a new localization of senile amyloidosis.
Gagné
F
F
Department of Pathology, Laval University, Quebec, Canada.
D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000378:metabolism; D000682:Amyloid / Q000378:metabolism*; D005260:Female; D006651:Histocytochemistry; D006801:Humans; D008297:Male; D008875:Middle Aged; D013130:Spinal Stenosis / Q000378:metabolism* / Q000473:pathology
D000682:Amyloid
Dépôts amyloïdes intraligamentaires dans la sténose du canal rachidien.