This case of P.V.N.S is reported for its rarity of incidence and a good result obtained with minimal open intervention. A 25 yr old male presented with chronic painless swelling of left knee joint of three month duration, to our orthopedic department. He did not report any history of injury. There was no locking and giving away sensation. Clinically effusion and synovial thickening was noted. Skin was stretched but without any signs of inflammation. No dilated veins. No ligament laxity was observed. Plain radiograph was not showing any changes. M.R.I of knee joint showed effusion, low signal intensity on both T1 and T1 weighed images with diagnosis of hyperplastic synovium. These findings were suggestive of pigmented villonodular synovitis. Arthroscopy was done under spinal anaesthesia. Dark red colored fluid drained from the joint with introduction of arthroscopy canula. Synovium was hypertrophic with villi formation with characteristic orange color. Widespread affection of synovium noted. Cruciate ligaments were covered with Synovium but were intact. Femoral and tibial articular surfaces were normal. Arthroscopic synovectomy was done using four anterior and two posterior portals to ensure maximum removal of affected synovium. Supra patellar pouch was having maximum amount of hypertrophic Synovium. Haemostasis was achieved with electrocautery. Sterile compression dressing was applied to prevent haemarthrosis. The synovial tissue was sent for histopathological examination. Suture removal was done on day 12. Range motion exercises were started as pain decreased. Histopathological examination showed a mononuclear stromal cell infiltrate in the synovial membrane. Hemosiderin-laden macrophages were observed giving the characteristic brown color. Additional cell populations included foam cells and multinucleated giant cells. These findings were consistent with diagnosis of PVNS. The patient returned to his job after 4 months. No recurrence was seen at the end of two years. The radiographs taken at 2 years showed no signs of degenerative changes.