Histological appearance of scleroderma include all except
**Core Concept**
Scleroderma, also known as systemic sclerosis, is a chronic autoimmune disease characterized by the deposition of collagen in the skin and internal organs, leading to fibrosis and organ dysfunction. Histologically, scleroderma is characterized by thickening of the dermal layer, vascular alterations, and the presence of various inflammatory cells.
**Why the Correct Answer is Right**
The histological appearance of scleroderma typically includes the following features:
* Thickening of the dermal layer due to increased collagen deposition, which can be visualized using Masson's trichrome staining.
* Vascular alterations, including hyalinization of blood vessels, which can lead to reduced blood flow and tissue ischemia.
* The presence of various inflammatory cells, such as lymphocytes, macrophages, and plasma cells, which contribute to the autoimmune process.
* The presence of mucin deposits, which can be visualized using Alcian blue staining.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a characteristic feature of scleroderma. Instead, it is more commonly associated with other skin conditions, such as psoriasis or eczema.
**Option B:** This option is incorrect because it is a feature of scleroderma, but not a histological hallmark. Instead, it is a clinical feature that can be observed in patients with scleroderma.
**Option C:** This option is incorrect because it is not a characteristic feature of scleroderma. Instead, it is more commonly associated with other autoimmune diseases, such as lupus or rheumatoid arthritis.
**Clinical Pearl / High-Yield Fact**
One key feature of scleroderma is the presence of anti-Scl-70 antibodies, which are directed against topoisomerase I and are highly specific for the disease. This antibody is often used as a diagnostic marker for scleroderma.
**Correct Answer: D.**