Tuberculoid leprosy is characterised by?
**Core Concept**
Tuberculoid leprosy is a form of leprosy characterized by a strong immune response against the Mycobacterium leprae, resulting in a limited number of skin lesions and nerve involvement. This form of leprosy is often associated with a single or few skin lesions, typically on the cooler areas of the body, and is usually accompanied by significant nerve damage.
**Why the Correct Answer is Right**
Tuberculoid leprosy is characterized by a cell-mediated immune response against the M. leprae, which leads to the formation of granulomas and the activation of macrophages and T-cells. The presence of these immune cells results in the destruction of the bacteria, but also causes significant damage to the surrounding skin and nerves. This type of leprosy is often associated with a high percentage of skin lesions that are hypopigmented or anesthetic, and may also involve the loss of sensation in the affected areas.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the characteristic skin lesions of tuberculoid leprosy.
**Option B:** This option is incorrect because it does not accurately describe the immune response associated with tuberculoid leprosy.
**Option C:** This option is incorrect because it does not accurately describe the nerve involvement associated with tuberculoid leprosy.
**Clinical Pearl / High-Yield Fact**
A key feature of tuberculoid leprosy is the presence of significant nerve damage, which can lead to loss of sensation and motor function in the affected areas. This is often accompanied by the presence of skin lesions that are hypopigmented or anesthetic.
**Correct Answer:** C.