RT Book, Section A1 Hoffman, William Y. A2 Lalwani, Anil K. SR Print(0) ID 55767372 T1 Chapter 20. Cleft Lip & Palate T2 CURRENT Diagnosis & Treatment in Otolaryngology—Head & Neck Surgery, 3e YR 2012 FD 2012 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-162439-8 LK accessmedicine.mhmedical.com/content.aspx?aid=55767372 RD 2024/03/29 AB In large series, the distribution of clefts is about 50% cleft lip and palate, 30% cleft palate only, and 20% cleft lip only. Cleft lip occurs most often on the left side; the distribution of left to right to bilateral cleft lip is approximately 6:3:1. Right-sided clefts are more commonly associated with syndromes. There is a slightly higher incidence in males.