||A 62-year-old man demonstrated symptoms, signs,
and radiographic evidence of lumbar spinal stenosis and intraoperative pathologic
findings of tophaceous deposition in the ligamentum flavum. Although there
have been reports of cervical calcium pyrophosphate dihydrate crystal deposition
(CPPD) with neurologic compression, this report appears to be the first
case of lumbar spinal stenosis secondary to CPPD. Cervical calcium pyrophosphate
dihydrate crystal deposition should be added to the differential diagnosis
of spinal stenosis.