A 10-year-old patient has no teeth on one side and radiographs show 'ghost teeth' (teeth with large pulp chambers, thin enamel and dentin). The diagnosis is:

Correct answer: A. Regional odontodysplasia

• A. Correct. Regional odontodysplasia (ghost teeth) is a localized developmental condition producing teeth with very thin, poorly mineralized enamel and dentin and extremely large pulp chambers, resulting in the 'ghost' appearance on radiographs. It typically affects teeth in one quadrant.
• B. Amelogenesis imperfecta affects only enamel formation — all teeth are affected, not regional.
• C. Dentinogenesis imperfecta affects dentin formation in all teeth — teeth appear translucent and wear excessively, but do not appear as 'ghost teeth.'
• D. Ectodermal dysplasia causes hypodontia/anodontia affecting multiple teeth throughout the mouth — not localized 'ghost teeth.'