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Context: Late on 2013 August 19, a coronal mass ejection (CME) erupted froman active region located near the far-side central meridian from Earth'sperspective. The event and its accompanying shock were remotely observed by theSTEREO-A, STEREO-B and SOHO spacecraft. The interplanetary counterpart (ICME)was intercepted by MESSENGER near 0.3 au, and by both STEREO-A and STEREO-B,near 1 au, which were separated by 78{\deg} in heliolongitude. The mainobjective of this study is to follow the radial and longitudinal evolution ofthe ICME throughout the inner heliosphere, and to examine possible scenariosfor the different magnetic flux-rope configuration observed on the solar disk,and measured in situ at the locations of MESSENGER and STEREO-A, separated by15{\deg} in heliolongitude, and at STEREO-B, which detected the ICME flank.Results: We find that the magnetic flux-rope structure detected at STEREO-Bbelongs to the same ICME detected at MESSENGER and STEREO-A. The oppositehelicity deduced at STEREO-B, might be due to the spacecraft intercepting oneof the legs of the structure far from the flux-rope axis, while STEREO-A andMESSENGER are crossing through the core of the magnetic flux rope. Thedifferent flux-rope orientations measured at MESSENGER and STEREO-A ariseprobably because the two spacecraft measure a curved, highly distorted andrather complex magnetic flux-rope topology. The ICME may have sufferedadditional distortion in its evolution in the inner heliosphere, such as thewest flank is propagating faster than the east flank when arriving 1 au.Conclusions: This work illustrates how the ambient conditions can significantlyaffect the expansion and propagation of the CME/ICME, introducing additionalirregularities to the already asymmetric eruption, and how these complexstructures cannot be directly reconstructed with the current models available.

Evidence of a complex structure within the 2013 August 19 coronal mass ejection. Radial and longitudinal evolution in the inner heliosphere