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R Donk

Publications and source records attributed to R Donk.

7 recordsLinked to original sources
PubMed2002

Primary non-Hodgkin's lymphoma in multiple vertebrae presenting as a lumbar radicular syndrome: A case report.

STUDY DESIGN: A case report is presented. OBJECTIVE: To report and discuss a case of primary non-Hodgkin's lymphoma in 10 different vertebrae in the spine of a 25-year-old woman. SUMMARY OF BACKGROUND DATA: To the authors' knowledge, a case of primary bone lymphoma in several vertebrae has not been reported previously. METHODS: Primary bone lymphoma was diagnosed using magnetic resonance images and biopsy of one spine lesion. There was no other localization of the lymphoma. RESULTS: With chemotherapeutic treatment, the lymphoma was in remission for 16 months. The patient then died of complications associated with acute lymphatic B-cell leukemia. CONCLUSIONS: The incidence of primary bone lymphoma in a population with non-Hodgkin's lymphoma is less than 1%. A case with multiple localizations of lymphoma in the spine has never been reported before.

Adult↗
PubMed2001

Height of cervical foramina after anterior discectomy and implantation of a carbon fiber cage.

OBJECT: The authors evaluate the effects of implantation of a carbon fiber cage after anterior cervical discectomy (ACD) on the height of the foramen and the angulation between endplates of the disc space. METHODS: Thirteen consecutive patients who were scheduled for standard microscopic ACD and interbody fusion underwent thin-slice (1.5 mm) spiral computerized tomography scanning 1 day preoperatively, 1 day postoperatively, and 1 year postoperatively. Oblique sagittal reconstructions were made through both foramina; the height of each foramen and the angle between the endplates were measured. Because 16 cages were implanted, 32 foramina were investigated. Preoperatively, the mean height of the foramina (+/- standard deviation) was 8.1 +/- 1.5 mm (range 5.7-12 mm), and at I day postoperatively it was 9.7 +/- 1.4 mm (range 7.5-12.8 mm). This difference reached statistical significance (p < 0.0005). The mean foraminal height after 1 year was 9.4 +/- 1.4 mm (range 6.9-12.7 mm). In terms of the preoperative value, the 1-year measurement still reached statistical difference (p < 0.005) but not with the direct postoperative mean foraminal height. Preoperatively the mean value of the angle between the two adjacent endplates was 1.3 +/- 2.4 degrees (range 0-8 degrees), and postoperatively it was 7.8 +/- 2.9 degrees (rauge 2-12 degrees), which was statistically significant (p < 0.0005). CONCLUSIONS: The cervical carbon fiber cage effectively increased the height of the foramen even after 1 year, which contributed to decompression of the nerve root. The wedge shape of the device may contribute to restoration of lordosis.

Adult↗
PubMed1991

[Operative therapy in tumor involvement of the spine].

We report on 56 patients, who underwent operative treatment of tumorous lesions of the spine. We indicated dorsal instrumentation in 14 cases, ventral tumorectomy in 11 cases and a combined dorsal and ventral instrumentation in 31 cases. The median survival time was 14.8 months. Reduction of pain and the improvement of the preexisting neurological symptoms were the most important postoperative factors. According to our follow-up study, the combined dorsal and ventral instrumentation seems to be the best method for an operative treatment of tumorous spine lesions.

Bone Transplantation↗
PubMed1990

Correction and stabilization of angular kyphosis.

Reconstruction of normal geometric relationships, regardless of original pathology, has to be the goal when treating angular kyphosis. Since anterior and posterior spinal structures are involved, successful decompression, correction, and stabilization require both dorsal and ventral surgery. By using segmental transpedicled and ventrolateral Instrumentation System implants, permanent fixation can be achieved. As a result, the length of the compression spondylodesis and fusion time are short. pedicular anchorage and implant design leave the joints and ligamentum flavum of healthy neighboring segments untouched. In the last five years, over 570 kyphotic deformities, including congenital kyphosis, spondylitis, tumors, and acute and neglected fractures, have been treated with this method. During a three- to five-year follow-up period of 40 patients with posttraumatic kyphoses, no additional neurologic damage, pseudarthrosis, or substantial loss of correction occurred.

Female↗