Progressive myelopathy due to idiopathic intraspinal tumoral calcinosis of the cervical spine. Case report.

Tumoral calcinosis is a rare disorder that most often occurs in periarticular regions of the extremities. Here, the authors report on an extremely rare case of idiopathic intraspinal tumoral calcinosis of the cervical spine. This 54-year-old man presented with a 2-week history of progressive cervical myelopathy. Results of magnetic resonance imaging and computed tomography myelography of the cervical spine revealed an intraspinal calcified mass lesion posterior to the spinal cord at the C3-4 level, resulting in marked spinal cord compression. Spinal cord decompression and en bloc resection of the mass lesion were performed via a C-2 laminoplasty and C3-4 laminectomy. The mass was localized in the dura mater. Histologically, the lesion consisted of numerous nodules with amorphous calcified materials and a florid proliferation of multinucleated giant cells; that is, its histological characteristics were identical to those of tumoral calcinosis. The symptoms disappeared completely after surgery. In all previously reported cases of cervical tumoral calcinosis, the lesion was located in the paraspinal soft tissue, with bone and facet joint involvement. The present case is the first reported instance of cervical tumoral calcinosis localized only in the spinal canal.