The Question
A 64-year-old woman is diagnosed with dermatomyositis. The diagnosis is made based on a 4-month history of progressive proximal muscle weakness, a heliotrope rash, Gottron's papules on her knuckles, a creatine kinase level of 4,500 U/L, and a positive anti-TIF1-gamma antibody. She is initiated on therapy with high-dose oral prednisone. Which of the following is the most important additional step in her management at this time?
See the answer and explanation below:
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A
Explanation
Clinical Pearl:
Dermatomyositis, particularly in older adults and those positive for anti-TIF1-gamma antibodies, is strongly associated with underlying malignancy. Extensive cancer screening is a critical part of initial management.
Explanation:
This patient has classic dermatomyositis (DM), and the presence of anti-transcription intermediary factor 1-gamma (TIF1-gamma) antibodies places her at very high risk for an underlying malignancy. The risk is highest in the first few years after diagnosis. Therefore, in addition to starting immunosuppressive therapy, the most important next step is to conduct a thorough search for an occult cancer with CT scans of the chest, abdomen, and pelvis, along with age-appropriate screenings like mammography and colonoscopy. While a muscle biopsy (B) is the gold standard for diagnosis, it is not essential to perform immediately in a patient with pathognomonic skin findings and a secure clinical diagnosis, especially after treatment has been started. Adding a steroid-sparing agent (C) is appropriate but typically occurs after assessing the initial response to prednisone over several weeks. Screening for interstitial lung disease with HRCT (D) is also important in DM, but the immediate mortality risk from an undiagnosed cancer, especially given her specific autoantibody, takes precedence. Physical therapy (E) is a key component of care but is not the most critical intervention at the time of diagnosis compared to the malignancy evaluation.
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