To cite: Magalhães-Costa P, Chagas C. BMJ Case Rep Published online: [please include Day Month Year] doi:10.1136/bcr-2015209745 DESCRIPTION A 60-year-old Caucasian Portuguese man, who had emigrated from Mozambique 30 years earlier, presented to our department with a 1-month history of epigastric pain, nausea, vomiting, weight loss and watery diarrhoea. He had two previous episodes of treated sy...

We introduce a general class of causal dynamic discrete-time nonlinearities which have certain monotonicity and Lipschitz continuity properties. In particular, the discretizations of a large class of continuous-time hysteresis operators obtained by applying the standard sampling and hold operations belong to this class. It is shown that closing the loop around a power-stable, linear, infinite-d...

Scattering off the edge of a composite particle or finite-range interaction can precede that its center. An effective theory treatment with pointlike particles and contact interactions must find scattered experimental wave is slightly advanced, in violation causality (the fundamental underlying being causal). In practice, partial-wave other projections multivariate amplitudes exponentially grow...

Concepts dealing with the subdivision of the human liver into independent vascular and biliary territories are applied routinely in radiological, surgical, and gastroenterological practice. Despite Couinaud's widely used eight-segments scheme, opinions on the issue differ considerably between authors. The aim of this article is to illustrate the scientific basis for understanding and harmonizin...