#He couldn’t - the Dark Lord is forced to exist in his stunted form.

J.K. Rowling addresses this question in an interview. She says that the Dark Lord doesn’t become a ghost, and is forced to exist in the stunted form seen in King’s Cross.

Jon: Since voldemort was afraid of death, did he choose to be a ghost if so where does he haunt or is this not possible due to his horcruxes

 

J.K. Rowling: No, he is not a ghost. He is forced to exist in the stunted form we witnessed in King's Cross.
_{^{- J.K. Rowling and the Live Chat, Bloomsbury (July 30, 2007)}}

That she says he was forced to exist in that form indicates that all other choices, including the choice to become a ghost, were taken away from him. Therefore, he could not have chosen to be a ghost. Presumably, this is because his soul was so damaged from making Horcruxes.

He couldn’t - the Dark Lord is forced to exist in his stunted form.

J.K. Rowling addresses this question in an interview. She says that the Dark Lord doesn’t become a ghost, and is forced to exist in the stunted form seen in King’s Cross.

Jon: Since voldemort was afraid of death, did he choose to be a ghost if so where does he haunt or is this not possible due to his horcruxes

J.K. Rowling: No, he is not a ghost. He is forced to exist in the stunted form we witnessed in King's Cross.
_{^{- J.K. Rowling and the Live Chat, Bloomsbury (July 30, 2007)}}

That she says he was forced to exist in that form indicates that all other choices, including the choice to become a ghost, were taken away from him. Therefore, he could not have chosen to be a ghost. Presumably, this is because his soul was so damaged from making Horcruxes.