Acute Calcific Tendinitis of Flexor Carpi Ulnaris: A Big Mimicker and Unusual Cause of Wrist Pain with a Pictorial Review

Calcifictendinitisof flexorcarpiulnaris(FCU)atthewristisanextremelyrarecauseof ulnarsidepainof thewrist. Owingtotheinfrequency of this entity, most cases are misdiagnosed as other diseases such as fractures, tendinopathies or infection. We present a case of recent-onset ulnar side wrist pain and swelling with a normal radiography. This case was referred to the imaging clinic to obtain magnetic resonance imaging (MRI) to rule out Kienbock disease. Multimodality imaging examination confirmed the correct diagnosisof acutecalcifictendinitis. Aftertwoweeksof rest, wristimmobilizationbysplintingandconsumptionof anti-inflammatories, the patient’s symptoms were resolved. To conclude, this case emphasizes the requirement of awareness about this uncommon but important cause of acute wrist pain and the need of applying imaging methods for an early and accurate diagnosis in order to avoid misdiagnosis and unwarranted treatments.