Knee joint synovitis

Case contributed by Dr Mostafa El-Feky


Right knee swelling, tenderness, redness, pain and limited motion.

Patient Data

Age: 1 year
Gender: Male

X-Ray right knee

X-ray of the right knee showed marked joint swelling with effusion.


MRI right knee

Marked right knee joint effusion with supra-patellar extension is seen. No diffusion restriction.

Diffusely thickened synovium with edematous changes and diffuse enhancement on contrast sequences. Stranding of Hoffa’s fat pad and irregular Hoffa’s fat pad sign present.

Normal signal of the epiphyseal cartilages of the lower femur and upper ends of the ipsilateral tibia and fibula.

Multiple enlarged reactive looking lymph nodes at popliteal fossa, the largest measuring 9 x 5 mm in dimensions.

Case Discussion

The patient’s clinical presentation lacking the constitutional and local manifestations of septic etiology, these findings represents changes of transient synovitis.

On MRI, there is often signal abnormality in adjacent bone marrow in septic arthritis.

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Case information

rID: 53311
Published: 13th May 2017
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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