  We present Very Long Baseline Interferometry (VLBI) observations of the high
mass X-ray binary LSI+61303, carried out with the European VLBI Network (EVN).
Over the 11 hour observing run, performed 10 days after a radio outburst, the
radio source showed a constant flux density, which allowed sensitive imaging of
the emission distribution. The structure in the map shows a clear extension to
the southeast. Comparing our data with previous VLBI observations we interpret
the extension as a collimated radio jet as found in several other X-ray
binaries. Assuming that the structure is the result of an expansion that
started at the onset of the outburst, we derive an apparent expansion velocity
of 0.003 c, which, in the context of Doppler boosting, corresponds to an
intrinsic velocity of at least 0.4 c for an ejection close to the line of
sight. From the apparent velocity in all available epochs we are able to
establish variations in the ejection angle which imply a precessing accretion
disk. Finally we point out that LSI+61303, like SS433 and Cygnus X-1, shows
evidence for an emission region almost orthogonal to the relativistic jet.
