Biomedical subjects
Publications and source records attributed to J Nepper-Rasmussen.
The distinction between the different types of dens axis fracture is important. Fractures at the base of dens (Type II) may be overlooked if reformated images are not made. If the fracture extends downward into the body of the vertebra (Type III), the body fragment may rotate into the spinal canal. The rotation is difficult to see on plain films, but is easily seen at axial CT.
A case of retroperitoneal duodenal rupture after a blunt abdominal trauma in a 16 year old boy is presented. Conventional x-ray examination and ultrasound examination made an early diagnosis possible. The diagnostic possibilities, especially concerning new techniques, are discussed.
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A case of persisting sciatic artery on both sides is described. It is a rare but interesting variant, because it may be diagnosed by palpating along the sciatic nerve.
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Twelve lumbar vertebral bodies from cadavers were examined with dual-energy CT, to measure the calcium content in a big central region of interest (ROI). In each of five vertebrae the calcium content was also measured in six small ROI. After completed scanning, six small cylinders were drilled out from each vertebra, and the ash-density of each cylinder was measured. The dual-energy CT measurements correlated well with the ash-density. Both ash-density and dual-energy CT showed a significantly higher mineral content in the posterior part of the vertebrae than in the anterior part, and this difference might be responsible for problems encountered with the reproducibility of dual-energy CT.