Biomedical subjects

T W Stadnik

Publications and source records attributed to T W Stadnik.

6 recordsLinked to original sources

PubMed1998

Annular tears and disk herniation: prevalence and contrast enhancement on MR images in the absence of low back pain or sciatica.

PURPOSE: To evaluate the prevalence and radiologic findings of annular tear (especially of contrast material enhancement), bulging disk, and disk herniation on T2-weighted and gadolinium-enhanced T1-weighted magnetic resonance (MR) images in people without low back pain (LBP) or sciatica. MATERIALS AND METHODS: Thirty-six volunteers without LBP and/or sciatica (18 with no symptoms in their lifetime and 18 who were pain free for at least 6 months) were examined with sagittal and axial T2-weighted fast spin-echo (SE) and sagittal gadolinium-enhanced T1-weighted fast SE imaging. The prevalence and MR findings of bulging disk, focal protrusion, extrusion, and nonenhancing or enhancing annular tears were assessed. RESULTS: The prevalence of bulging disk and focal disk protrusion was 81% (29 volunteers) and 33% (12 volunteers), respectively. There were no extrusions. Twenty-eight annular tears were found in 20 patients (56%); 27 tears (96%) also showed contrast enhancement. CONCLUSION: Annular tears and focal disk protrusions on MR images, with or without contrast enhancement, are frequently found in an asymptomatic population. Extruded disk herniation, displacement of nerve root, and interruption of annuloligamentous complex are unusual findings in an asymptomatic population and can be more closely related to patients with LBP or sciatica.

Adult↗

PubMed1992

[Superselective cerebral embolization of an arteriovenous malformation in the temporal lobe following partial neurosurgical resection].

We report a case of cerebral embolization of an arteriovenous malformation in the temporal lobe after partial neurosurgical resection. The lesion consisted of two compartments of which only the lateral part with combined large hematoma was resected. The medial compartment was treated by superselective embolization using a microcatheter and polyvinyl alcohol particles. Because of his psychiatric condition, general anaesthesia was used in this young male.

Adult↗

PubMed1988

CT-assisted chemonucleolysis.

The safety and success rate of chemonucleolysis are largely dependent on correct needle insertion. The neurological complications of chemonucleolysis are related to inadvertent puncture of the dura, nerve root and/or spinal nerve. To avoid this complication, a puncture angle of 50 degrees to 60 degrees above the sagittal plane is widely recommended (1). Our CT study of the location of the spinal nerve L4-L5 and L5-S1 demonstrates a great variability of this location and also explains some of the possible hazards of 50 degrees to 60 degrees puncture (2). The CT-evaluation of the relationship between the nerve root, spinal nerve and apophyseal joint with respect to the puncture angle is suitable. In our experience, this method is helpful for fast, safe and easy insertion of the needle.

Humans↗

PubMed1987

Diagnosis of herniated nucleus pulposus by digital spinal phlebography with false negative CT and/or radiculosaccography.

Saccoradiculography, spinal phlebography or NMR can be performed in cases of discrepancy between CT and clinical symptoms. We believe that the introduction of DSA must generate a renewed interest in spinal phlebography for cases with radicular syndrome and normal CT.

Adult↗

PubMed1985

Intracranial tumors examined by intraarterial DSA: a comparative angiography study.

We compared intraarterial digital subtraction angiography (DSA) studies with those of conventional angiography, performed for 24 patients who had intracranial tumors. Intraarterial DSA is more effective in evaluating tumoral blush and venous phase, but neovascularization can be judged better by conventional angiography. In most cases, intraarterial DSA can replace conventional angiography for the diagnostic and preoperative evaluation of intracranial tumors. However, conventional angiography remains the technique of choice for the evaluation of neovascularization or if the patient is not cooperative.

Brain↗

PubMedDate not supplied

Optimization of sequence parameters in fast MR imaging of the brain with FLASH.

Owing to the intrinsically complex behavior of the signal intensity of fast gradient-refocusing MR sequences, agreement as to the clinically most useful sequence parameters has not yet been reached. This study evaluates the FLASH (fast low-angle shot) sequence for gray-white matter differentiation on normal volunteers at 1.5 T. The FLASH gradient-echo sequence is essentially T1-dependent. For very fast imaging and T1 weighting, the following parameters yield the best results: a flip angle of 30-50 degrees with TR = 20 and TE = 10. To replace T1-weighted SE by the faster FLASH sequence, the best results are achieved by a flip angle of 70-120 degrees with TR = 150-300 and TE = 10 (or shorter, if possible). The most valuable proton-density aspect is achieved by a flip angle of 30 degrees with TR = 300 and TE = 16.

Brain↗