title: Intramuscular juvenile xanthogranuloma: sonographic and MR findings.
abstract: BACKGROUND
  Juvenile xanthogranuloma is a rare benign lesion, most often cutaneous or subcutaneous, and found in infants.
  
  
  OBJECTIVE
  To review the imaging approach to an intramuscular mass in an infant.
  
  
  METHODS
  A case is reported of a 2-month-old boy who presented with a solitary left arm mass which was evaluated with ultrasound and MRI and then biopsied.
  
  
  RESULTS
  Imaging demonstrated a well-defined homogeneous solid mass located in the triceps muscle. The mass was resected and pathology revealed intramuscular juvenile xanthogranuloma.
  
  
  CONCLUSIONS
  Intramuscular juvenile xanthogranuloma, although extremely rare, has imaging features similar to those of more common malignant tumors of infancy. The imaging findings are nonspecific, but this diagnosis should be considered in the differential of a solid intramuscular mass in an infant.
authors.affiliation: Division of Pediatric Radiology, Department of Radiology, Massachusetts General Hospital, 34 Fruit Street, White 246, Boston 02114, USA.
authors.forename: James K
authors.initials: JK
authors.lastname: David
authors.forename: Sudha A
authors.initials: SA
authors.lastname: Anupindi
authors.forename: Vikram
authors.initials: V
authors.lastname: Deshpande
authors.forename: Diego
authors.initials: D
authors.lastname: Jaramillo
mesh_terms: D001707:Biopsy, Needle; D002675:Child, Preschool; D003287:Contrast Media; D005682:Gadolinium; D006801:Humans; D007150:Immunohistochemistry; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D009135:Muscular Diseases / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000601:surgery; D011379:Prognosis; D011856:Radiographic Image Enhancement; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D016896:Treatment Outcome; D018608:Ultrasonography, Doppler / Q000379:methods*; D014972:Xanthogranuloma, Juvenile / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000601:surgery
chemical_list: D003287:Contrast Media; D005682:Gadolinium