Objective
To evaluate the current pattern of cleft lip and/or palate deformities in Lagos, Nigeria.

Design
Descriptive epidemiology.

Setting
Statewide survey of patients.

Participants/Methods
All patients with cleft lip and palate deformities that were seen during a screening program for individuals with orofacial deformities in Lagos, Nigeria, between June 2006 and May 2008 participated in this study. Demographic data were collected and physical examinations carried out. Cleft lip and/or palate deformities were classified using the Kernahan classification for common cases and the Tessier classification for the atypical cleft defects.

Results
A total of 225 patients were enrolled and completed the study. Cleft lip and palate was the most common presentation and was found in nearly 45% of the patients. Cleft lip was found in 61 (27%) patients. Twenty patients (8.89%) with different types of rare orofacial cleft deformities were seen. Cleft lip with or without cleft alveolus deformities occurred more commonly among males; whereas, cleft palate was more common among females. Cleft lip and/or palate occurred more frequently among males. Cleft lip with or without cleft alveolus was found predominantly on the left side.

Conclusions
The pattern of cleft lip and/or palate deformities in Lagos, Nigeria, is different from those of other parts of Nigeria in some aspects. The proportion and varieties of atypical orofacial deformities in the study are striking. The prevalence of cleft lip and/or palate deformities in the study was 2.25 per 100,000. There may be an association between the prevalence of atypical deformities and the high level of environmental pollutants in the Lagos area.