Introduction: Lipoma Arborescens (LA) is a rare, benign synovial condition, primarily affecting the knee, characterized by the growth of adipocytes within the synovial membrane. Case Presentation: Patient 1:A23 year-old male presented with left knee pain and swelling for three months. . Symptoms included stiffness, particularly after rest, and progressive limitation of joint mobility. Patient 2 :A 25 -year-old male presented with right  knee pain and swelling for 8 years. Symptoms included stiffness, particularly after rest, and progressive limitation of joint mobility. Patient 3 :A 22-year-old male presented with progressive swelling and intermittent pain in the leftknee for duration of  2 years . The symptoms were associated with mild stiffness and reduced range of motion. Patient  4 : A 32-year-old male presented with chronic swelling and intermittent pain in the rightknee over the past  5 years . Symptoms included stiffness, particularly after rest, and progressive limitation of joint mobility. There was no history of trauma, systemic symptoms, or prior joint disease in these patients. On examination, a soft, mobile, non-tender mass was palpable, with reduced range of motion Conclusion: Recognizing the MRI features of LA is crucial for accurate diagnosis. Arthroscopic synovectomy offers effective treatment with excellent outcomes.MRI showed characteristic frond-like synovial masses, leading to a diagnosis of LA, confirmed by arthroscopic biopsy.