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Grey-Scale Without PD Significance — SCE Rheumatology MCQ

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ModerateMusculoskeletal ImagingGrey-Scale Without PD SignificanceSCE Rheumatology

A 55-year-old woman with established rheumatoid arthritis has no clinically swollen joints, a normal CRP and a DAS28-CRP at target. Ultrasound of an MCP joint demonstrates grey-scale synovial hypertrophy but no power Doppler signal. Doppler settings have been optimised and flow is visible in adjacent vessels. Which is the most accurate interpretation?

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Reveal the answer and explanation

Correct answer: D — Synovial hypertrophy is present without detectable hypervascularity and requires clinical correlation

Explanation lettering: B = shown as A · A = shown as B

Power Doppler assesses detectable synovial blood flow, so its absence indicates no demonstrable hypervascularity under technically adequate conditions. It does not prove that grey-scale hypertrophy is fibrotic or biologically inactive: Doppler-negative hypertrophy can decrease with effective treatment, and higher grey-scale burdens may retain prognostic significance. The ultrasound result should therefore be integrated with examination, inflammatory markers and composite disease activity. It neither conclusively establishes remission (C) nor, by itself, mandates DMARD escalation (E); ultrasound-driven escalation has not consistently improved outcomes over clinical treat-to-target care. Grey-scale hypertrophy is not automatically a normal variant (A), and an adequately optimised Doppler-negative scan remains interpretable (B).

Reference: Terslev L, Østergaard M, Sexton J, Hammer HB. Is synovial hypertrophy without Doppler activity sensitive to change? Post-hoc analysis from a rheumatoid arthritis ultrasound study. Arthritis Research & Therapy. 2018;20:224. https://pubmed.ncbi.nlm.nih.gov/30285845/