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 (anti topoisomerase) is positive. Painful hands in this patient are best described using which of the following terms?

**Core Concept**
The patient's symptoms, including severe headaches, pain and blanching of the hands upon exposure to cold, and progressive difficulty in swallowing solid food, along with the presence of smooth and tight skin over the face and fingers, are characteristic of systemic sclerosis (scleroderma). The serologic test for anti-Scl-70 (anti-topoisomerase) is a specific marker for this condition.

**Why the Correct Answer is Right**
The patient's symptoms are consistent with the pathophysiology of systemic sclerosis, which involves the activation of fibroblasts and the deposition of collagen in the skin and internal organs. The presence of anti-Scl-70 antibodies indicates an autoimmune response against topoisomerase I, an enzyme involved in DNA replication and repair. The pain and blanching of the hands upon exposure to cold are characteristic of Raynaud's phenomenon, a common manifestation of systemic sclerosis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the patient's symptoms and serologic findings.
**Option B:** While this option is related to systemic sclerosis, it is not the most specific term for the patient's condition.
**Option D:** This option is not a recognized medical term for the patient's symptoms.

**Clinical Pearl / High-Yield Fact**
Systemic sclerosis can involve multiple organs, including the skin, gastrointestinal tract, lungs, and kidneys. The presence of anti-Scl-70 antibodies is associated with a higher risk of pulmonary fibrosis and renal involvement.

**Correct Answer:** C. Raynaud's phenomenon.

✓ Correct Answer: D. Raynaud phenomenon