Main symptoms are anterior knee pain and swelling.
Chronic irritation due to trauma or repetitive kneeling lead to accumulation of fluid within the prepatellar bursa and sometimes haemorrhagic transformation.
Hypoechoic fluid sometimes contains debris are noted anterior to the patellar surface.
Oval shaped fluid filled sac is seen anterior to the patella and displays low T1 and bright T2/STIR signal intensity. When hemorrhage occurs T1 signal increases and T2 GRE signal reduces.
Treatment and prognosis
Local injection of non steroid anti-inflammatory drugs and steroids or local application of ice, and finally bursectomy in resistant cases.