lsmr (least squares minimal residual) is an iterative method for the solution of the linear system of equations and leastsquares problems. this paper presents a block version of the lsmr algorithm for solving linear systems with multiple right-hand sides. the new algorithm is based on the block bidiagonalization and derived by minimizing the frobenius norm of the resid ual matrix of normal equa...

introduction the eustachian valve (ev) remnant, when present in adults, is usually rudimentary. however, in echocardiographic examinations, it may appear as a mobile long structure in the right atrium, and it rarely protrudes into the right ventricle. when it is quite large, the ev remnant could be misdiagnosed as a right atrial tumor, thrombus, or vegetation. case presentation an 83-year-old p...

dural arteriovenous fi stula (davf) is also known as dural arteriovenous malformation. two forms of davf have been introduced, however, here we present an exceptional case of davf with unique origin and drainage. in this study, we present a rare case of multiple davfs in a 50 year old man with right parietal intraparenchymal hemorrhage. mri showed two round right parieto-occipital masses with f...