A 45-year-old woman presents with a 4-month history of severe headaches and pain, and blanching of the hands upon exposure to cold. She is a nonsmoker. Over the past 6 months, she has noticed progressive difficulty in swallowing solid food. Physical examination reveals smooth and tight skin over the face and fingers. The serologic test for anti-Scl-70 (antitopoi-somerase) is positive. Painful hands in this patient are best described using which of the following terms?

**Core Concept**
The patient's symptoms of painful hands, blanching upon exposure to cold, and smooth tight skin are indicative of a systemic autoimmune disorder affecting the skin and connective tissue, particularly the hands and fingers. This condition is characterized by fibrosis and vascular abnormalities.

**Why the Correct Answer is Right**
The patient's symptoms are consistent with limited systemic scleroderma, also known as limited systemic sclerosis. The presence of anti-Scl-70 antibodies (antitopoisomerase) further supports this diagnosis, as these autoantibodies are highly specific for systemic sclerosis. The painful hands are a result of fibrosis and vascular damage to the skin and subcutaneous tissues, leading to reduced blood flow and subsequent ischemia.

**Why Each Wrong Option is Incorrect**
**Option A:** Raynaud's phenomenon is a common feature of systemic sclerosis but is not the best term to describe the patient's painful hands. Raynaud's phenomenon typically refers to the episodic vasospasm of the digital arteries.
**Option B:** Erythromelalgia is a condition characterized by burning pain, heat, and redness of the hands and feet, typically associated with myeloproliferative disorders or genetic mutations. It does not match the patient's presentation.
**Option C:** Sclerodactyly refers to the thickening and tightening of the skin on the fingers, which is a feature of systemic sclerosis, but it does not specifically describe the painful hands.
**Option D:** Vasculitis refers to inflammation of the blood vessels, which can cause pain, but it is a more general term and does not specifically describe the patient's condition.

**Clinical Pearl / High-Yield Fact**
Systemic sclerosis is a complex autoimmune disorder with a wide range of clinical manifestations, including skin thickening, vascular damage, and internal organ involvement. The presence of anti-Scl-70 antibodies is highly suggestive of systemic sclerosis, but the diagnosis should be made based on a combination of clinical, laboratory, and histopathological findings.

**Correct Answer:** C. Sclerodactyly

✓ Correct Answer: D. Raynaud phenomenon