Posttraumatic soft-tissue cyst - knee

Case contributed by Dr Maulik S Patel


Trauma to knee - 6 wks back. C/o anterior knee swelling without much pain.

Patient Data

Age: about 45 - 50 yrs
Gender: Female

Soft tissue swelling is noted in anterior knee, involving supra - pre - infra patellar region.

Quadriceps and patellar tendon soft tissue shadow are separately visualized.

No fracture / dislocation.


Site of swelling shows an encapsulated fluid collection with tiny echoes. Single echogenic ovoid focus is noted within the lesion - fat globule. Few thin avascular septa are present. Thin wall ( upto 1.5 mm ) is noted surrounding the lesion.

Adjacent fat is echogenic.

Patellar and quadriceps tendon - intact.

No joint effusion noted in suprapatellar recess.


Case Discussion

Findings favor post traumatic soft tissue cyst involving knee.

If morphologically similar lesion is noted over the greater trochanter of the femur, then it is called as 

Morel Lavallée lesion.

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Case information

rID: 32631
Published: 7th Dec 2014
Last edited: 16th Jul 2018
Inclusion in quiz mode: Included

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