Petros Benias

American gastroenterologist. At the time of the 2018 Scientific Reports paper Benias was at Mount Sinai Beth Israel Medical Center and the Icahn School of Medicine at Mount Sinai; he is now at Northwell Health's Long Island Jewish Medical Center, where he is Chief of Endoscopy. His clinical-research interests centre on advanced therapeutic endoscopy, pancreatobiliary disease, and the probe-based confocal laser endomicroscopy (pCLE) techniques that enabled the 2018 finding.

Stake§

Benias's stake is clinical and methodological. The 2018 paper was first-authored as a relatively junior member of the Theise / David Carr-Locke collaboration, and the career arc from that paper into chief-of-endoscopy positions reflects both the clinical-endoscopy reputation it built and the genuine pCLE expertise he brought to the work. The technical commitment to in-vivo imaging methods that preserve tissue fluid is the through-line.

Benias's clinical training is in gastroenterology, with sub- specialisation in therapeutic endoscopy and the techniques that have grown up around the probe-based confocal laser endomicroscopy platform. The pCLE method is what made the 2018 finding possible: by examining bile-duct tissue in vivo with fluorescein illumination, before the standard slide-preparation process could collapse the tissue's fluid spaces, the imaging revealed structured sinuses with no known anatomical correlate. The recognition that these were not artefacts but real fluid-filled compartments was the methodological move; the broader interstitium-as-compartment argument was the pathological one, supplied by Theise.

The post-2018 work has continued in clinical endoscopy rather than in pure anatomical research. Benias has been a productive gastroenterologist in his own right — the kind of clinical-academic career where the high-profile paper is a single episode within a broader pattern of procedural and pancreatobiliary research. The public-facing visibility of the interstitium finding has been substantial; the underlying career has been less so, which is probably the right balance.

Benias is the clinician-endoscopist whose methodological commitment to pCLE imaging made the paper possible. The first-author position reflects the technical work; the framing choices were collaborative. The career has continued largely along the lines the work suggested — clinical endoscopy at a tertiary- care institution, with research interests in the imaging techniques that motivated the original finding.