RESUMO
Triangulated observations of fireballs allow us to determine orbits and fall positions for meteorites. The great majority of basaltic meteorites are derived from the asteroid 4 Vesta. We report on a recent fall that has orbital properties and an oxygen isotope composition that suggest a distinct parent body. Although its orbit was almost entirely contained within Earth's orbit, modeling indicates that it originated from the innermost main belt. Because the meteorite parent body would likely be classified as a V-type asteroid, V-type precursors for basaltic meteorites unrelated to Vesta may reside in the inner main belt. This starting location is in agreement with predictions of a planetesimal evolution model that postulates the formation of differentiated asteroids in the terrestrial planet region, with surviving fragments concentrated in the innermost main belt.
RESUMO
We report a rare case of adenocarcinoid tumor of the ampulla of Vater. The tumor contained an intermixture of adenocarcinoma and carcinoid tumor and was removed successfully by pancreaticoduodenectomy. The characteristics of these rare tumors are reviewed.
Assuntos
Adenocarcinoma/patologia , Ampola Hepatopancreática , Tumor Carcinoide/patologia , Neoplasias do Ducto Colédoco/patologia , Dor Abdominal/etiologia , Adenocarcinoma/complicações , Adenocarcinoma/cirurgia , Tumor Carcinoide/complicações , Tumor Carcinoide/cirurgia , Neoplasias do Ducto Colédoco/complicações , Neoplasias do Ducto Colédoco/cirurgia , Feminino , Humanos , Pessoa de Meia-Idade , Pancreaticoduodenectomia , PrognósticoRESUMO
BACKGROUND: The use of screening mammography in women aged 40 to 50 years is controversial because of a relative lack of data demonstrating survival benefit for this segment of the population. PATIENTS AND METHODS: The charts of 809 consecutive women who underwent needle localized breast biopsy over a 6 1/2-year period were reviewed to determine the effect of age on the biopsy results. Patient ages ranged from 27 to 91 years (mean 56). RESULTS: Two hundred nineteen (27%) of the 809 needle localized breast biopsies were malignant, with a mean tumor diameter of 1.46 cm. This procedure identified malignancy in 3 (5%) of 60 patients age 40, and in 32 (15%) of 207 patients aged 40 to 49 years. Malignancy was significantly more likely in patients 50 years of age or older and was found in 184 (34%) of the 542 (P<0.001). Overall, 33% of all patients undergoing the procedure were under age 50. CONCLUSIONS: Without screening mammography, the diagnosis of breast cancer would have been delayed in 32 women aged 40 to 50, 15% of the total diagnosed with nonpalpable breast cancer in this study. We recommend the use of screening mammography in this age group.
