A 45 year old male had multiple hypoaesthetic mildly erythematous large plaques with elevated margins on trunk and extremities. His ulnar and lateral popliteal nerves on both sides were enlarged. The most probable diagnosis is:
**Core Concept**
The patient's presentation of large, hypoaesthetic plaques with erythema and enlarged nerves suggests a systemic disorder affecting the peripheral nerves and skin. This condition is characterized by the deposition of abnormal proteins in the skin and nerves, leading to inflammation and damage.
**Why the Correct Answer is Right**
The patient's symptoms are consistent with **Nephrogenic Systemic Fibrosis (NSF)**, also known as **Acquired Dermatomyositis-like Illness (ADLI)**. NSF is a rare condition associated with the use of gadolinium-based contrast agents in patients with severe renal insufficiency. The deposition of gadolinium in the skin and nerves leads to fibrosis and inflammation, causing the characteristic skin lesions and nerve enlargement. The condition is often seen in patients with end-stage renal disease.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not match the patient's presentation. **Lichen planus** is a chronic inflammatory disease affecting the skin and mucous membranes, but it does not typically cause nerve enlargement.
* **Option B:** This option is incorrect as it is not consistent with the patient's symptoms. **Scleroderma** is a chronic autoimmune disease affecting the skin and connective tissue, but it does not typically cause large, hypoaesthetic plaques with erythema.
* **Option C:** This option is incorrect as it does not match the patient's presentation. **Erythema multiforme** is a skin condition characterized by target-shaped lesions, but it does not typically cause nerve enlargement.
**Clinical Pearl / High-Yield Fact**
NSF is a rare but serious condition that can occur in patients with severe renal insufficiency who receive gadolinium-based contrast agents. It is essential to consider NSF in the differential diagnosis of patients with skin and nerve lesions, especially those with a history of renal disease.
**Correct Answer: D. Nephrogenic Systemic Fibrosis (NSF)**