Tenosynovial giant cell tumor (TSGCT) is a slow-growing soft tissue tumor that develops from the synovial tissue of tendon sheaths, joints, or bursae. In the knee, this type of tumor is uncommon. Giant cell tumors of the cruciate ligaments' tendon sheath are far more infrequent. Only 16 localized TSGCTs of the cruciate ligaments have been recorded in the literature to our knowledge, with 9 involving the anterior cruciate ligament (ACL) and 7 involving the posterior cruciate ligament (PCL). We present a rare case of localized TSGCT arising from the PCL's femoral insertion in a 44-year-old male, as well as a literature review on localized TSGCT of cruciate ligaments in the knee. The diagnosis of tumor's presence was made using MRI while the definitive diagnosis was obtained through intraoperative evaluation and postoperative pathology. Arthroscopic tumor resection was an effective and safe treatment option based on the available data. •Giant cell tumors of the cruciate ligaments are extremely uncommon.•The most typical clinical presentations are pain and decreased range of motion of the knee without a history of trauma.•MRI helps confirm the presence of a tumor but not its original location or type.•Based on available data, arthroscopic tumor removal is an effective and safe treatment option.