Soft tissue tumors are the most prevalent tumor lesions in the extremities, of which lipomas are the most frequent tumors in soft tissue, highlighting that these are benign conditions, despite being tumors, however, intra-articular cases are extremely rare, which contrasts with arborescent lipomas that are well described in the literature, which are secondary to degenerative processes in the knee and not neoplastic lesions. Intra-articular lipomas are rare, with the most common location being the knee, followed by the hip, lumbar spine, elbow, shoulder and wrist. Within the lipomas of the knee we find the arborescent lipoma, this is the product of degenerative changes established in the joint, which will be compromised and will give a manifest clinical appearance depending on its extension and size, which in turn will allow us to determine adequate management. surgical, in this case report we present a resection performed through arthroscopy and open approach due to a large lesion that generated joint blockage which subsides after the intervention.