A total of 165 patients diagnosed with de novo idiopathic PC-BPPV were recruited; 42 patients were eliminated from the study for the following reasons: 11 patients required more than four CRP session; for five patients, the symptoms were not ameliorated after CRP; six patients refused to participate in this study; 13 patients lost to follow-up; and seven patients developed other medical conditions. Here, CRP is linked to pachyonychia congenita.