How to get rid of orphan LOB objects (segments)

After dropping all objects (tables, views, synonyms, sequences, packages) from a schema, there remained a few objects of type LOB, for which the corresponding segments take up some space.

They are still registered in the USER_OBJECTS and USER_SEGMENTS views, but not in USER_LOBS, not even in DBA_LOBS.

Their names are system generated, of the kind of SYS_LOB0000240626C00011$$.

Is there any way how to get rid of such objects without dropping and recreating the schema?

Thanks for any ideas.

Pavel