|Title : Case 630|
Age / Sex : 46 / F
Chief complaint : Left knee pain for 1 week
Calcific tendinitis (calcium hydroxyapatite deposition disease), biceps femoris tendon on fibular attachment
Plain radiograph shows a well-defined, ovoid shaped, calcified mass over left fibular head.
MRI shows intratendinous calcified mass of low signal intensity at the fibular attachment of biceps femoris with diffuse biceps femoris muscle and lateral subcutaneous edema.
Soft tissue chondroma
Periarticular calcific tendinitis is an inflammatory condition associated with calcium hydroxyapatite crystal deposition disease processes. The shoulder is most commonly involved, but has also been seen in the hip, elbow and wrist joints. Hydroxyapatite crystals may deposit in the tendons, ligaments, joint capsule, soft tissues or bursae. Calcific deposits around the knee have been described involving the lateral collateral ligament, vastus lateralis and popliteus tendons.
The radiographic appearance of the crystal deposits reflects the duration of disease: initially, the crystals appear poorly defined and cloudlike, but as the disease progresses, they appear denser and homogeneous with a linear or circular configuration. MRI shows extensive edema in the muscle and adjacent bone marrow as high T2 signal intensity.
AJR Am J Roentgenol. 2003;181(1):199-202.
|Total applicants||31||Correct answers||20|
|장민영||국민건강보험공단 일산병원, 전문의|
|심주경||순천향대 부천병원, 전공의|