Diagnostic Approach for Pseudogout (CPPD)

Diagnostic Tests

Arthrocentesis is the definitive diagnostic test and should be performed whenever possible to secure the diagnosis, according to the European League Against Rheumatism (EULAR) guidelines 1
Use ultrasound guidance for joint aspiration when anatomical landmarks make the procedure challenging, as this improves success rates and avoids ionizing radiation, as recommended by the EULAR guidelines 1
The American College of Rheumatology emphasizes that imaging has been incorporated into recent diagnostic recommendations for CPPD, highlighting the importance of conventional radiography and advanced imaging techniques 2, 3

The 2023 EULAR guidelines note that serial imaging is NOT recommended for monitoring CPPD unless there is unexpected clinical deterioration, emphasizing the need for targeted imaging approaches 4, 1
Unlike gout, there is no evidence supporting routine follow-up imaging in CPPD, according to the EULAR guidelines 4

The EULAR guidelines recommend mandatory screening for underlying conditions in patients presenting with CPPD before age 60, including serum magnesium to detect hypomagnesemia 5
Early-onset disease requires investigation for hemochromatosis, as emphasized by the EULAR guidelines 6

Identify medications that may precipitate CPPD, particularly loop diuretics like furosemide that cause magnesium depletion, as recommended by the EULAR guidelines 7, 5

The EULAR guidelines emphasize that determining the clinical presentation pattern guides treatment decisions, as management differs substantially between acute attacks requiring rapid symptom relief versus chronic disease requiring long-term symptom control 8

Do not rely solely on imaging, as chondrocalcinosis on radiographs is common in elderly patients and may be asymptomatic, according to the EULAR guidelines 1
Do not assume the diagnosis without crystal confirmation when possible, as other conditions can mimic CPPD clinically and radiographically, as emphasized by the EULAR guidelines 1
Do not skip metabolic screening in younger patients, as treatable conditions like hemochromatosis require early identification, according to the EULAR guidelines 6

In patients presenting with clinical features suggestive of axial calcium pyrophosphate deposition (e.g., crowned dens syndrome), a CT scan of the involved region should be performed to evaluate for crystal‑related calcifications and guide management. Evidence level not specified. 9