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L M Numerow

Publications and source records attributed to L M Numerow.

5 recordsLinked to original sources
PubMed1994

Hydroxyapatite orbital implants. Scanning with technetium-99m MDP.

Porous hydroxyapatite spheres are an ideal prosthetic device for orbital implantation because they are incorporated into soft tissues. Once vascularized, an eye prosthesis can be coupled to the sphere by a peg placed within a central motility hole. This hole should not be drilled while the sphere is avascular because of the risk of infection. Radionuclide scanning with Tc-99m methylene diphosphonate has been used to assess implant vascular ingrowth because radiophosphonate deposition within the sphere parallels vascularization. Using this technique, the authors examined the hydroxyapatite implants of 15 patients 6 months following insertion. Results showed that complete vascularization is best defined by planar imaging rather than SPECT. While the relative intensity of implant activity may be an important feature, uniformity of activity is probably more significant.

Durapatite↗
PubMed1994

Pseudodelta sign on computed tomography: an indication of bilateral interhemispheric hemorrhage.

The "pseudodelta sign" is introduced as an indicator of interhemispheric hemorrhage. This sign, appearing in computed tomography (CT) scans, consists of hyperattenuated extra-axial blood surrounding blood flowing in the superior sagittal sinus, which shows lower attenuation. To determine the prevalence of interhemispheric hemorrhage and the pseudodelta sign in patients with post-traumatic extra-axial hemorrhage, the authors reviewed the charts and CT scans of 198 such patients. The patients had been admitted to a tertiary-care hospital between Jan. 1, 1986, and Dec. 1, 1990. Interhemispheric hemorrhage was visible in 18 cases; the pseudodelta sign was seen in 14 of these. In 8 of the 14 cases the interhemispheric hemorrhage consisted of bilateral subdural hematoma, and in 3 it consisted of unilateral subdural hematoma. In the remaining three cases the appearance of the interhemispheric blood was nonspecific, and the hemorrhage may have been subdural or subarachnoid. The pseudodelta sign may be a good indicator of interhemispheric hemorrhage in either the subdural or subarachnoid space.

Adolescent↗
PubMedDate not supplied

Persistent/recurrent hyperparathyroidism: a comparison of sestamibi scintigraphy, MRI, and ultrasonography.

For patients with persistent or recurrent hyperparathyroidism, parathyroid imaging is indicated to confirm the presence of abnormal parathyroid gland(s) and identify their location. These imaging techniques are being modified constantly and newer methods have been developed. Sestamibi scintigraphy, MRI and sonography were compared in 23 patients with persistent or recurrent hyperparathyroidism. Preoperative 99m-Technetium Sestamibi (MIBI), MRI and ultrasonographic (US) studies of 23 patients with 25 histopathologically confirmed abnormal parathyroid glands were compared, using independent prospective interpretations. All patients had been operated upon previously for hyperparthytroidism. Accuracy of various combinations of MRI, MIBI, and US also were calculated. The results are shown for all abnormal glands (n =25); sensitivities and accuracies were 88 and 84% for MRI, 80 and 80% for MIBI, and 58 and 44% for US. For only parathyroid adenomas (n = 18), sensitivities and accuracies were 89 and 89% for MRI, 94 and 94% for MIBI, and 58 and 39% for US. Finally, for parathyroid hyperplasia (n = 7 glands in five patients), sensitivities and accuracies were 83 and 71% for MRI, 43 and 43% for MIBI, and 57 and 57% for US. Either MIBI or MRI results were significantly better for detecting abnormal parathyroid glands than US (P < 0.01), but MRI and MIBI were not statistically different. Combining MRI and MIBI produced a combined accuracy of 92%, whereas combining either of these tests with US did not improve on the accuracy of either test alone. In conclusion, for patients with persistent or recurrent hyperparathyroidism, MRI and MIBI are equally accurate for detecting abnormal parathyroid glands, and the combination of both tests may be more accurate than either test alone.

Adenoma↗