Definition: Hypoplastic and hypocalcified enamel and dentin.
Location: Typically associated with one quadrant.
Shape: Large pulp chambers and root canals with thin enamel and dentin. Frequently described as ‘ghost’ teeth.
Internal: Radiolucent pulp chambers and root canals. Radiopaque enamel and dentin.
Number: Associated with teeth in one quadrant.
(click image to enlarge)
(note the enlarged pulp chamber and root canal)