Congenital pulmonary lymphatic duct hypoplasia in a fetus with hydrops fetalis found at delivery: A case report.

Objective: To elaborate the clinical characteristics of congenital pulmonary lymphangiectasia in a neonate with hydrops fetalis. This could be an alert in considering it as a differential diagnosis for neonates with acute respiratory failure.

Methods: We reviewed and analyzed single-center registry patients who underwent cadaveric autopsies in the Department of Pathology at Children's Hospital from January 1, 2010 to December 31, 2021.

Vortex formation of spherical self-propelled particles around a circular obstacle.

A vortex is a common ratchet phenomenon in active systems. The spatial symmetry is usually broken by introducing asymmetric shapes or spontaneously by collective motion in the presence of hydrodynamic interactions or other alignment effects. Unexpectedly, we observe, by simulations, the formation of a vortex in the simplest model of a circular obstacle immersed in a bath of spherical self-propelled particles.