Welsh, Carson, Anderson & Stowe-backed US Radiology Specialists, a physician-owned radiology group, completed the acquisition of Windsong Radiology Group, a radiology practice. Financial terms were not disclosed. "Windsong is an excellent fit for US Radiology. This pioneering group complements our strategy to work with leading subspecialized radiologists and to be national leaders in outpatient imaging. We're excited to grow both our physician practice network and outpatient imaging footprint by teaming up with another top radiology practice," John Perkins, US Radiology CEO.