Reply to 'Commentaries on the publication entitled: Structure and distribution of an unrecognized interstitium in human tissues by Benias et al. (2018)'

The 2019 reply in the European Journal of Anatomy is the Benias group's short response to Pedro Mestres-Ventura's commentary in the same issue. Three of the original eleven authors — Petros C. Benias, Rebecca G. Wells, and Neil D. Theise — signed the reply; it appears at pp. 483–485 of volume 23(6), three pages, immediately after the Mestres-Ventura piece at pp. 479–481.

The reply acknowledges Mestres-Ventura's attention and addresses what the authors read as fundamental misunderstandings — the most significant being one of scale. The 2018 finding, in Benias and colleagues' restatement, was not that interstitial fluid spaces exist (they have been known since the nineteenth century); it was that the spaces are organised at a macroscopic, continuous, collagen-supported scale that the standard histological slide- preparation method had been collapsing and hiding. The contested claim, the authors clarify, is about the scale and architecture of the fluid compartment, not its existence.

The piece sits as the Benias group's substantive defence in the peer-reviewed literature against the not actually new line of critique. It is brief, civil, and concedes Mestres-Ventura's methodological points while contesting his ontological reading. The exchange — Mestres-Ventura's commentary, Benias et al.'s reply, both in the same November 2019 issue of the same journal — is the canonical published debate over the interstitium framing and the place to read for the substantive disagreement.

The stake is professional and disciplinary on both sides: Mestres-Ventura defending the anatomy tradition's record against press-amplified rebranding, the Benias group defending the scale-and-architecture novelty of their finding against the nothing new dismissal. The reply deserves to be taken seriously as the position-defence it is; the unsettled question remains how much of the unrecognised framing the imaging genuinely warrants.