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Table 1 Main clinical features of reported patients

From: Intra-articular venous malformations of the knee: a diagnostic challenge

Age at symptoms onset/sex Symptoms at first evaluation Time to diagnosis Arthrocentesis performed Localization History of trauma Cutaneous signs of VM Treatment Recurrence
16 mo / M Swelling. 18 mo Yes, bloody Knee, intrasynovial, extensive. + - Surgical excision -
3 yr / F Pain, swelling. 7 yr Yes, bloody Knee, intrasynovial, anteromedial. + - Surgical excision -
7 yr / M Pain, swelling, restricted joint motion. 2 yr Yes, bloody Knee, intrasynovial, retropatellar. - - Surgical excision -
4 yr / F Pain, swelling, restricted joint motion. 1 yr Not performed Knee, intrasynovial, medial. - - Surgical excision -
4 yr / M Pain, swelling, restricted joint motion. 6 yr Not performed Knee, intrasynovial, anterior. + - Surgical excision -