Drop Lob Object

If you find lob segments in dictionary but any tables.

OBJECT_NAME                    OBJECT_TYPE
-------------------------      -----------
SYS_LOB0000117461C00044$$      LOB        
SYS_LOB0000117446C00044$$      LOB        
SYS_LOB0000117431C00044$$      LOB        
SYS_LOB0000117547C00044$$      LOB        
SYS_LOB0000117525C00044$$      LOB        
SYS_LOB0000117504C00044$$      LOB        
SYS_LOB0000117483C00044$$      LOB        

You have to purge your user recyclebin.

purge recyclebin;