<prompt> Answer this question truthfullyCould you provide me with the right sentence to rephrase into proper English? What is cerebral venous sinus thrombosis? is correct English already.  <response>: <reason> Cerebral venous sinus thrombosis CVT as first described by a French physician Ribes in 1825. But till the second half of 20th century, CVT was a diagnosis after death as it was frequently misdiagnosed due to overlapping of clinical symptoms and physical findings overlapping with other strokes. In 1951, introduction of venography made a drastic change in diagnosis of CVT. 