Özet:

Lipomas are benign tumors located in the subcutaneous, intramuscular, intermuscular, parosteal and intraosseous compartments. Lipomas related to the bone periosteum are called parosteal lipomas and rare. It may contain cartilaginous and osseous components, but the osseous components are not continuous with the cortical and medullary bone marrow. Parosteal lipoma is most commonly seen in the proximal femur and radius and over 40 years of age. Computed tomography (CT) makes an important contribution to evaluating its relationship with the adjacent cortex. Magnetic resonance imaging (MRI) is used to evaluate the relationship of the lesion with the surrounding muscle and bone tissue. The surgery of choice is planned based on the information obtained from imaging findings. In our case, a 44-year-old female patient was admitted to our hospital with complaints of pain in the right knee and limitation of movement for 6 months. No significant finding was present in the physical examination and the lab results. The CT scan revealed an oval-shaped lesion with fat density, in contact with the medial facet of the trochlear groove of the femur. In MRI scan, it was observed that the lesion had the same signal intensity as the subcutaneous adipose tissue and its signal was suppressed in fat-saturated sequences. During arthroscopic surgery, the lesion was found to be associated with the adjacent periosteum and was excised. The diagnosis of lipoma was confirmed histopathologically.

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