Knee Synovial Haemangioma: A Case Report and Imaging Perspective on Diagnosis.

Synovial haemangioma is a rare benign entity, most common in children and adolescents. These tumours can extensively infiltrate joint structures and periarticular soft tissues, making management challenging. Magnetic resonance imaging (MRI) has a key role in diagnosis and therapeutic planning. The authors report the case of a 17‑year‑old male with multiple synovial haemangiomas, highlighting the complexity of management and the essential role of MRI in assessment and treatment. Teaching point: Synovial haemangiomas may lead to bone remodelling, periarticular soft‑tissue infiltration and, ultimately, limb deformities and early‑onset osteoarthritis. Magnetic resonance imaging (MRI) is crucial for diagnosis as well as for guiding therapeutic planning.