Lipoma Arborescens in a 10-Year-Old Boy

Area of Science:

• Orthopedics
• Pediatric Rheumatology
• Musculoskeletal Oncology

Background:

• Lipoma arborescens is a rare intra-articular benign neoplasm characterized by villous hyperplasia of the synovium.
• It typically presents with chronic joint pain and effusions, predominantly affecting the knee.
• While rare in adults, it is exceptionally uncommon in pediatric populations.

Observation:

• A previously healthy 10-year-old boy presented with a persistent, painful left knee effusion.
• Diagnostic workup included radiography, magnetic resonance imaging (MRI), and laboratory tests.
• The findings were consistent with a diagnosis of lipoma arborescens.

Findings:

• The patient underwent successful arthroscopic synovectomy to remove the lipoma arborescens.
• Post-operative recovery was complete, with resolution of symptoms.

Implications:

• This case highlights lipoma arborescens as a treatable cause of chronic knee effusion in children.
• Early diagnosis and surgical intervention, such as arthroscopic synovectomy, can lead to excellent functional outcomes.
• Further research into the etiology and optimal management of pediatric lipoma arborescens is warranted.