Question

the malignant tumor that is in the apex of the lung and causes tingling of the left arm and weakness of the hand muscles supplied by the ulna nerve is which of the following?
horner syndrome
caplan syndrome
pancoast syndrome
carcinoid syndrome

Explanation:

To solve this, we analyze each option:

• Horner syndrome: Related to sympathetic nerve palsy (ptosis, miosis, anhidrosis), not matching the lung apex tumor with ulnar nerve - related symptoms.
• Caplan syndrome: Associated with rheumatoid arthritis and pneumoconiosis, not lung apex tumors.
• Pancoast syndrome: Caused by a tumor (Pancoast tumor) at the lung apex, which can involve nerve compression (including those affecting the arm like the ulnar nerve - related hand muscle weakness and tingling), matching the description.
• Carcinoid syndrome: Related to carcinoid tumors and symptoms like flushing, diarrhea, not lung apex - related nerve symptoms.

Answer:

C. Pancoast syndrome