Source: The Great Interpretation of Dreams (Ibn Sirin)
(By analogy with a fracture) A cast in a dream indicates fixing a corrupt matter or mending a broken heart (comforting someone). Wearing it indicates patience and endurance.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A cast indicates a man who reconciles people. Removing it indicates the removal of worry and healing.
Source: Signs in the Science of Expressions (Ibn Shaheen)
A cast is interpreted as goodness. Whoever sees one on himself will attain goodness.