Source: The Great Interpretation of Dreams (Ibn Sirin)
(By analogy with a wound and healing) A surgical operation in a dream indicates the uncovering of a hidden matter or the correction of a corrupt situation. Its success indicates the righteousness of the matter, and its failure indicates its corruption.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
(By analogy) A surgical operation indicates the removal of worry and recovery from illness after fatigue.
Source: Signs in the Science of Expressions (Ibn Shaheen)
(By analogy) A surgical operation is interpreted as relief. Whoever sees himself undergoing one, God will relieve his worry.