ABSTRACT
Initial images of Venus's south pole by the Venus Express mission have shown the presence of a bright, highly variable vortex, similar to that at the planet's north pole. Using high-resolution infrared measurements of polar winds from the Venus Express Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) instrument, we show the vortex to have a constantly varying internal structure, with a center of rotation displaced from the geographic south pole by ~3 degrees of latitude and that drifts around the pole with a period of 5 to 10 Earth days. This is indicative of a nonsymmetric and varying precession of the polar atmospheric circulation with respect to the planetary axis.
ABSTRACT
In the past 9 years, 3 children suffering rare pancreatic disorders have undergone cephalic pancreaticoduodenectomy (Whipple procedure) required after the failure of initial conservative treatments. Ductal anomalies such as pancreas divisum or predominant Santorini duct can be managed conservatively (especially by papillotomy of the minor papilla), unless the extent of the fibrotic lesions of the pancreas jeopardizes the final evolution of the pancreatic disease. Intrapancreatic gastric duplications remain extremely rare. Even to-day, diagnosis was made only on pathologic specimens after radical surgery. Better knowledge of this rare pathology, with emphasis on its radiological features, may help better assessment. Hemoductal pancreatitis is evocative of the coexistence of gastric duplication and pancreatic aberrant duct. However, when fibrotic and necrotic changes in the duodenopancreatic region are considerable, assessment of this anomaly becomes difficult. Radical though it is, pancreaticoduodenectomy may be necessary to treat cephalic pancreatic lesions in childhood after the failure of reasonable attempts of conservative treatment.
