A new preprint demonstrates lensless 3D imaging through scattering tissue via synthetic wavelength holography (SWH) on a multicore multimode fiber, recovering objects at ~500 μm resolution over a 46° field of view without distal optics. The method combines dual-wavelength captures to create longer synthetic wavelengths less perturbed by modal dispersion or intervening scatterers, enabling recovery in single-layer scattering phantoms and real biological tissue. This extends prior fiber endoscopy work by bypassing numerical aperture limits through larger étendue scattered fields. However, the arXiv submission (May 2026, v1) remains unpeer-reviewed with unspecified sample sizes and controlled lab geometries rather than in vivo trials. Related advances, such as the 2023 Optics Express demonstration of SWH for non-invasive imaging (Balaji et al. collaborators) and a 2021 Nature Photonics paper on multimode fiber holography, show similar path-length tolerance but highlight persistent speckle noise at depth. Missed in coverage: SWH's computational overhead may limit real-time use, and 500 μm resolution lags standard endoscopes for early tumor detection. Limitations include assumption of single scattering dominance and lack of motion artifact testing.