Nonpalpable breast masses: radiologic predictability of malignancy.

Of 568 nonpalpable breast lesions detected by screening mammography 242 proved to be noncalcified masses; biopsy showed 165 to be benign and 77 malignant. The lesions were evaluated with respect to contour, radiographic density and size. Of the malignant lesions 90% were infiltrating carcinomas, 88% of which had an indistinct contour and were of moderate to high density.

Sensitivity to vecuronium in myasthenia gravis: a dose-response study.

A cumulative dose plus infusion technique and integrated EMG monitoring of the first dorsal interosseous muscle were used to determine the potency of vecuronium in 20 normal patients and in ten patients with myasthenia gravis under thiamylal, N2O, O2, fentanyl anaesthesia. The mean (+/- SEM) values for ED50, ED90, and ED95 in the normal patients were 19 +/- 1, 31 +/- 1 and 36 +/- 2 micrograms.kg-1, respectively.

Surgery for nonpalpable breast lesions.

Nonpalpable lesions detected on mammograms were localized in 475 women between 1976 and 1988 by means of the spot method. A malignant neoplasm was noted in 149 patients (31%), including 69 (33%) of 206 with clusters of microcalcifications, 16 (41%) of 39 with calcifications associated with densities and 64 (28%) of 230 with nonpalpable masses. Infiltrating lesions were present in 89 (60%) of 149 patients.

Occult malignant breast lesions in 114 patients: relationship to age and the presence of microcalcifications.

This study evaluates the mammographic findings in 352 patients, aged 30-85 years, who underwent spot localization and biopsy for evaluation of nonpalpable breast abnormalities. Malignancy was found at biopsy in 114 cases. The mammographic appearance (specifically, whether grouped microcalcifications, mass, or both were present) was correlated with patient age and histologic findings (specifically, whether the pathologic changes were infiltrating or noninfiltrating in nature).