It is a fluid build up on top of the knee cap
Fluid build up above the knee cap
medial joint space narrowing bilaterally (sounds like arthritic/age-realted change in both knees) with enthesopathic change anteriorly on the patella bilaterally at the insertion of the quadriceps tendons (unhealthy tendon changes) suprapatellar effusion (swelling above the kneecaps, probably nothing you haven't noticed already)
The plural form of the noun 'effusion' is effusions.
Above the patella (kneecap), denoting especially a bursa. From Stedman's Medical Dictionary
The mortality would depend on how severe the pleural effusion is and what the cause of the effusion is. Some things that cause pleural effusion have a low mortality, while others are high.
Long effusion is not always cancer
The rate of effusion for nitrogen is higher.
Effusion means giving off something (like light or smell). The effusion from the mysterious liquid made me feel queasy.
no pleural effusion no pulmonary nodule no endobronchial lessions of the lungs
Graham's law of effusion.
The movement of gas through a small hole into an area of lower pressure is diffusion.