This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bone, Subject name: Orthopaedics
Kanavel's sign is seen: 
Select and explain. 
A. Flexor tendon sheath infectious inflammation in the hand, B. Mid palmar space abscess, C. Ulnar bursa, D. Web space involvement
A: Flexor tendon sheath infectious inflammation in the hand
Answer: A: Flexor tendon sheath infectious inflammation in the hand 
Explanation: Ref: Orthopaedic dictionary by Stanley Hoppenfeld, Michael S. Zeide, page 190 & Wheeless' Textbook of Orthopaedics - 'Infectious flexor tenosynovitis' (online textbook)Explanation:Kanavel's signIt is a clinical sign found in patients with infection of a flexor tendon sheath in the hand, a serious condition which can result in rapid loss of function of the affected finger.The sign consists of four components:- The affected finger is held in slight flexion.- There is fusiform swelling over the affected tendon.- There is tenderness over the affected tendon.- There is pain on passive extension of the affected finger.The sign is named after Allen B. Kanavel.