Final answer:
Horner's syndrome is a condition characterized by symptoms including shoulder pain, ptosis, constricted pupil (mitosis), and facial edema. It is caused by damage or disruption of the sympathetic nerves that supply the face and neck. A tumor in the thoracic cavity can affect these autonomic functions and lead to the symptoms of Horner's syndrome.
Step-by-step explanation:
The symptoms described in the question, including shoulder pain, ptosis, constricted pupil (mitosis), and facial edema, are consistent with a condition called Horner's syndrome. Horner's syndrome is caused by damage or disruption of the sympathetic nerves that supply the face and neck.
This can occur due to a tumor in the thoracic cavity, which can compress the sympathetic nerves and affect their function. The sympathetic nerves are responsible for controlling various autonomic functions, including pupil dilation, eyelid elevation, and regulation of blood vessels.
When these nerves are affected, it can lead to symptoms such as pupillary constriction, drooping of the eyelids, and facial swelling. Therefore, a tumor in the thoracic cavity can have an effect on these autonomic functions and cause the symptoms described in the question.