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On physical examination, when a patient flex the knee joint, pain has been aggravated, but has not limited range of motion and instability. The magnetic resonance imaging scan showed the intraarticular well-defined cystic lesion that was visualized with low signal intensity in T1 weighted image and high signal intensity in T2 weighted image measured about 12×14×22mm. The lesion was located in the mid portion of posterior cruciate ligament and has no connection to the adjacent structures. We used arthroscopy as diagnosis and treatment. Arthroscopic examination demonstrated a white-grayish cystic mass in the mid portion of posterior cruciate ligament and another cystic mass that measured about 8×8×10mm has been detected at the medial meniscal posterior horn. The yellowish mucous fluid was found during cyst excision. At 6 months after operation, the knee was asymptomatic and there was no evidence of recurrence.