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Pathology · single question

Regarding cleft lip and palate epidemiology, which statement is TRUE?

  1. Unilateral cleft lip is more common on the LEFT side than the right
  2. Isolated cleft palate is more common in males
  3. Unilateral cleft lip is more common on the right side
  4. Cleft lip with or without cleft palate is more common in females
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Correct answer: A. Unilateral cleft lip is more common on the LEFT side than the right

  • A. Correct. Unilateral cleft lip is approximately twice as common on the LEFT side compared to the right. Cleft lip ± cleft palate is more common in males. Isolated cleft palate (without cleft lip) is more common in females.
  • B. Isolated cleft palate (without lip involvement) is more common in FEMALES — not males.
  • C. The left side is more commonly affected — right-sided unilateral cleft is less common.
  • D. Cleft lip with or without cleft palate is more common in MALES — not females.

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