A 63-year-old woman develops skin lesions, and difficulty getting out of a chair. A clinical diagnosis of dermatomyositis is made. What might the findings include?For the above patient, select the associated skin and clinical findings.
**Core Concept**
Dermatomyositis is a type of inflammatory muscle disease characterized by skin manifestations and muscle weakness. It is an autoimmune disorder that involves the immune system attacking the muscle cells and skin. The pathophysiology involves the deposition of immune complexes in the skin and muscle, leading to inflammation and tissue damage.
**Why the Correct Answer is Right**
The classic skin findings in dermatomyositis include heliotrope rash, Gottron's papules, and erythema over the knuckles. Gottron's papules are violaceous, flat-topped papules that are typically located over the extensor surfaces of the joints, particularly over the knuckles, elbows, and knees. The heliotrope rash is a purple-colored rash that appears on the eyelids. The patient's difficulty getting out of a chair is likely due to muscle weakness, particularly of the proximal muscles. The muscle weakness in dermatomyositis is often symmetrical and affects the muscles of the shoulder and hip girdles.
**Why Each Wrong Option is Incorrect**
**Option A:** While muscle weakness is a common finding in dermatomyositis, it is not the only possible finding. Other options may also be associated with the disease.
**Option B:** Erythema over the knuckles can be a finding in dermatomyositis, but it is not the most specific or sensitive finding. Gottron's papules are more characteristic of the disease.
**Option C:** The heliotrope rash is a classic finding in dermatomyositis, but it is not the only possible finding. Other options may also be associated with the disease.
**Option D:** Muscle atrophy is not a typical finding in dermatomyositis. The disease is characterized by muscle weakness, but muscle atrophy is more typical of other muscle diseases.
**Clinical Pearl / High-Yield Fact**
Remember the "5 Ps" of dermatomyositis: proximal muscle weakness, photosensitivity, purplish rash, periungual changes, and polyarthritis. These findings can help diagnose the disease.
**Correct Answer: A. Gottron's papules and erythema over the knuckles.**