ObjectiveTo investigate the effectiveness of concealed penis correction surgery based on the principle of midline symmetry.MethodsBetween January 2016 and September 2018, 18 children with concealed penis were treated with correction surgery based on the principle of midline symmetry. All children were 3-12 years old, with an average age of 8.3 years. Physical examination showed that the penis was short; the penis body could not be exposed or be exposed too limited; the corpus cavernosum developed well. The pressure dressing was removed at 3 days after operation and the urethral tube was removed. The color of the glans, the swelling and congestion of penis and scrotum, and the blood supple of the prepuce flap were observed.ResultsThe operation time ranged from 47 to 54 minutes, with an average of 50 minutes. All children were followed up 3 months after operation. There was no hemorrhage and necrosis of the glans and no infection or ischemic necrosis of the flap. All patients had different degree of prepuce edema at 3 days after operation, 5 patients still had prepuce edema at 2 weeks, and the prepuce edema in all patients subsided at 3 months. All penises were exposed well after midline symmetric anastomosis with no bulky prepuce and scrotum.ConclusionThe correction surgery based on the principle of midline symmetry can be used to correct the appearance of the concealed penis effectively.