Soft tissue lipoma - knee

Case contributed by Dr Maulik S Patel

Presentation

One year history of nodular swelling on the anterolateral aspect of knee - infrapatellar.

Patient Data

Age: 55 years
Gender: Female
Race: Indian/Pakistani
x_ray

There is a focal area of increased soft tissue density at the lower end of the patellar ligament.  The rest of the soft tissue reveals no abnormality. Apart from a tiny patellar osteophyte, there is no other bony abnormality.

ultrasound

There is a well-defined, subcutaneous lesion in the region of interest. It is located between the distal end of the iliotibial band and the lateral edge of the distal part of the patellar tendon. The lesion is separate from both structures. The lesion abuts the proximal tibial cortex without erosion. The size of the lesion is 18 (craniocaudal) x 18 (transverse) x 9 (anteroposterior) mm. It is hyperechoic with few tiny hypoechoic areas within. The lesion shows a well-defined thin hypoechoic rim - capsule. There is no calcification/ internal vascularity.

Case Discussion

A female presented with a painless knee swelling for the last one year. Features are consistent with soft tissue lipoma, which was confirmed pathologically.

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