system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
"Air crescent" sign is seen in
assistant
The correct answer is  "Air crescent" sign is seen in fungal ball or aspergilloma in a tubercular cavity. Ref ganong's review of medical physiology 25e 765