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Extradural haemangiolipoma in the spinal canal. Two cases presenting during pregnancy.

Extradural spinal haemangiolipomas are very rare but they account for forty per cent of all lipomas in this position. The two cases described here were middleaged women who both had a paraparesis during their pregnancy which remitted after parturition. Both tumours were in the thoracic region on the posterior surface of the dura. The histological appearances were those of a lipoma with a definite capillary component. The pathogenesis of the relapsing and remitting paraplegia and its relationship with pregnancy is probably multi-factorial. It is proposed that both blood volume and extra-cellular fluid volume changes occurring during pregnancy may be responsible for the fluctuating cord compression. Similarly the hypothesis is put forward that due to the vascularity of the tumour it exerts a "steal" phenomenon over the blood supply to the adjacent cord. Also, because of its vascularity, the tumour could have a pulsatile compressive effect on the cord.

Female↗

Quantitative analysis of the cervical spinal canal by computed tomography.

Computed tomography measurements of the AP diameter, width, and cross-sectional area of the bony cervical canal were derived from cervical spine examinations of fifty-two normal adults. These quantitative parameters were then used to evaluate 80 patients with various cervical abnormalities to determine the clinical usefulness of the measurements. With the exception of spinal stenosis, quantitative cervical canal analysis was found to be of limited usefulness since normal measurements frequently occurred in the presence of significant cervical pathology.

Adolescent↗