title: Isolated trochlear nerve palsy as a presenting feature of primary polycythemia rubra vera.
abstract: A case is reported where the onset of vertical diplopia secondary to a trochlear nerve palsy occurred as the presenting feature of polycythemia rubra vera. This may be the first report of an isolated trochlear nerve palsy secondary to polycythemia rubra vera and infarction of the fascicle or nerve.
authors.forename: Michael M
authors.initials: MM
authors.lastname: Jones
authors.forename: Colin I
authors.initials: CI
authors.lastname: Clement
authors.forename: Dominic B
authors.initials: DB
authors.lastname: Rowe
mesh_terms: D000368:Aged; D004172:Diplopia / Q000175:diagnosis*; D006801:Humans; D008297:Male; D011087:Polycythemia Vera / Q000175:diagnosis*; D020432:Trochlear Nerve Diseases / Q000175:diagnosis*