[A male with a suprapatellar mass]

Area of Science:

• Rheumatology
• Orthopedic Surgery
• Pathology

Background:

• Gout is a common form of inflammatory arthritis caused by hyperuricemia and deposition of monosodium urate crystals.
• Untreated or inadequately managed gout can lead to chronic complications, including tophi formation.
• Tophi are urate crystal deposits that can occur in various soft tissues, joints, and bones.

Observation:

• A 52-year-old male patient presented with a gradually enlarging suprapatellar mass over several years.
• The patient had a history of gout 12 years prior, for which he received no treatment.
• Imaging studies and histopathological examination were performed to diagnose the mass.

Findings:

• The suprapatellar mass was confirmed to be a gout tophus.
• Histopathology revealed characteristic monosodium urate crystal deposition and associated inflammatory changes.
• The tophus represented a chronic manifestation of previously untreated gout.

Implications:

• This case underscores the importance of consistent gout management to prevent chronic complications like tophi.
• Suprapatellar tophi can mimic other soft tissue masses, necessitating thorough diagnostic evaluation.
• Recognition of tophi in unusual locations is crucial for accurate diagnosis and appropriate patient care in rheumatology and orthopedic settings.