Robuta

https://pmc.ncbi.nlm.nih.gov/articles/PMC4627115/ Apogeotropic Posterior Semicircular Canal Benign Paroxysmal Positional Vertigo: Some Clinical and... We lately reported the cases of patients complaining positional vertigo whose nystagmic pattern was that of a peripheral torsional vertical positional down... posterior semicircular canal positional vertigo benign