Assertion: lung cancer's tumor | /r/HasSubevent | horner's syndrome
Facets:
Source sentences:
text: Tumors in the top of the lung, known as Pancoast tumors, may invade the local part of the sympathetic nervous system, resulting in Horner's syndrome (dropping of the eyelid and a small pupil on that side), as well as damage to the brachial plexus.