**Question:** Positive Adsons test is seen in -

A. Tuberculosis
B. Thyroid disorders
C. Congenital chest wall deformities
D. Breast cancer with axillary lymph node involvement

**Core Concept:**
The Positive Adsons test is a clinical test used to evaluate for possible axillary or mediastinal pathology. It is named after Sir Astley Cooper Adson, a British surgeon. The test is performed by gently palpating the fourth intercostal space on the anterior chest wall, just below the clavicle. Positive results suggest compression or involvement of the axillary or mediastinal structures.

**Why the Correct Answer is Right:**
The correct answer is D: Breast cancer with axillary lymph node involvement. A positive Adson's test is indicative of compression or involvement of the axillary vessels or lymph nodes. In the context of breast cancer, the presence of axillary lymph node involvement can lead to a positive Adson's test result.

**Why Each Wrong Option is Incorrect:**
A. Tuberculosis (TB) is a pulmonary infection, not a condition involving the axillary lymph nodes or structures.
B. Thyroid disorders primarily affect the thyroid gland and hormones, not the axillary lymph nodes or structures.
C. Congenital chest wall deformities do not typically cause a positive Adson's test result, as they usually affect the underlying structures but do not compress them directly.

**Clinical Pearl:**
In clinical practice, interpreting Adson's test results should be combined with a thorough clinical examination, including physical signs suggestive of breast or axillary pathology. This can help narrow down the differential diagnosis and guide further investigations and management options.

**Correct Answer:** D. Breast cancer with axillary lymph node involvement