Hypotony, posterior retinal breaks, longer axial lengths and total retinal detachments (RD) are risk factors for development of RD associated with choroidal detachment (RRDCD). This study retrospectively analysed the anatomic outcomes and prognostic factors of vitrectomy in 175 patients with primary RRDCD. In these patients, suprachoroidal fluid was drained in moderate to severe choroidal detachment (CD) to decrease the height of the CD during vitrectomy. Overall primary and final re-attachment rates were 72.6% and 89.1% respectively. Re-attachment rate was significantly better with increasing age, proliferative vitreoretinopathy (PVR) grade (A-B better than C) and preoperative intravitreal steroid (4mg triamcinolone acetonide, five to seven days before surgery). There was no statistically significant difference in re-attachment rates for extent and severity of CD.