Site of TB bursitis -a) Prepatellarb) Subacromialc) Subdeltoidd) Subpatellare) Trocanteric
**Core Concept**
Tuberculosis (TB) bursitis is a rare form of extrapulmonary tuberculosis that affects the synovial-lined fluid-filled spaces, known as bursae, in the body. This condition is characterized by the infection of a bursa with Mycobacterium tuberculosis, leading to inflammation and potential damage to surrounding tissues.
**Why the Correct Answer is Right**
The correct answer is **C. Subdeltoid**. The subdeltoid bursa is a type of bursa located between the deltoid muscle and the humerus, in the shoulder region. This bursa is susceptible to TB infection due to its proximity to the lung and the fact that it receives lymphatic drainage from the upper limb, which can potentially harbor TB bacilli. The infection of the subdeltoid bursa can lead to symptoms such as pain, swelling, and limited mobility of the shoulder.
**Why Each Wrong Option is Incorrect**
* **Option A:** Prepatellar bursitis is a condition that affects the prepatellar bursa, which is located in front of the kneecap. While it is a common condition, it is not typically associated with TB infection.
* **Option B:** Subacromial bursitis affects the subacromial bursa, which is located between the acromion and the supraspinatus tendon. This condition is often related to shoulder impingement or rotator cuff injuries, but not typically to TB infection.
* **Option D:** Subpatellar bursitis affects the subpatellar bursa, which is located beneath the kneecap. This condition is often related to knee injuries or overuse, but not typically to TB infection.
* **Option E:** Trochanteric bursitis affects the trochanteric bursa, which is located near the greater trochanter of the femur. This condition is often related to hip or pelvis disorders, but not typically to TB infection.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that TB bursitis can occur in any bursa, but it's more common in bursae that are in close proximity to the lung or have a rich lymphatic supply. A high index of suspicion is required to diagnose TB bursitis, especially in patients with a history of TB exposure or symptoms that are not responding to conventional treatment.
**Correct Answer:** C. Subdeltoid