Intramuscular Venous Malformation in an Infant Masquerading as Recurrent Gonarthritis

a Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan b Department of Pediatrics, University of Occupational and Environmental Health, Kitakyushu, Japan c Department of Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan d Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan e Department of Perinatal and Pediatric Medicine, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan