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Difficulty: MediumMedical History Evaluation

A 52-year-old man is evaluated in the ambulatory care center for a 3-month history of progressive muscle weakness. He reports increasing difficulty rising from low chairs and lifting objects above his head. Over the past month, he has also developed a violaceous, erythematous rash on his upper eyelids and scaling, erythematous papules over his metacarpophalangeal joints. He reports an unintentional 6-kg (13.2-lb) weight loss during this period. His past medical history is notable for mild osteoarthritis. He has had no previous surgeries. He does not use tobacco or illicit drugs and consumes alcohol occasionally. He takes no daily medications or dietary supplements. Vital signs are within normal limits. Physical examination confirms 3/5 strength in the proximal muscle groups of the upper and lower extremities symmetrically. Reflexes are 2+ and symmetric. Sensation is intact. Based on the most likely diagnosis, eliciting a detailed history regarding which of the following is the most critical next step in this patient's evaluation?

  1. Adherence to age-appropriate malignancy screening protocolsAnswer
  2. B
    Utilization of lipid-lowering pharmacotherapy
  3. C
    Prior adverse reactions to systemic glucocorticoids
  4. D
    Family history of genetic neuromuscular disorders
  5. E
    Previous abnormalities in thyroid function tests

Answer

Adherence to age-appropriate malignancy screening protocols
The correct answer recognizes that adult-onset dermatomyositis is frequently a paraneoplastic syndrome. The patient's clinical presentation of symmetric proximal muscle weakness paired with pathognomonic skin findings (heliotrope rash and Gottron papules) strongly indicates dermatomyositis. In adults, this condition is associated with an underlying malignancy in up to 25% of cases. Therefore, reviewing the patient's adherence to age-appropriate cancer screening protocols is a vital first step to direct a targeted workup for occult malignancy.

Step-by-Step Solution

1
Identify the primary clinical syndrome based on the patient's symptoms and physical examination findings.
The combination of symmetric proximal muscle weakness, a heliotrope rash, and Gottron papules confirms a clinical diagnosis of dermatomyositis.
Accurate pattern recognition of these pathognomonic signs is required to narrow the differential diagnosis.
2
Recall the major systemic associations and complications of the identified condition in an adult patient.
Adult-onset dermatomyositis has a strong association with underlying malignancies (paraneoplastic syndrome).
Understanding disease associations dictates the appropriate next steps in diagnostic evaluation.
3
Determine the most appropriate historical inquiry to address this serious association.
A thorough review of the patient's adherence to age-appropriate malignancy screening is required to guide further targeted cancer workup.
Identifying an occult malignancy is critical for patient survival and may also impact the management of the myositis itself.

Key Concept

Adult-onset dermatomyositis is highly associated with underlying malignancies; therefore, eliciting a thorough history regarding age-appropriate cancer screening is a critical component of the initial evaluation.
Estimated Time:1m 0s
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Topics

Medical History Evaluation

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