Rheumatoid pseudotumor of urinary bladder simulating carcinoma

Area of Science:

• Rheumatology
• Uropathology

Background:

• Rheumatoid arthritis is a chronic autoimmune disease.
• Rheumatoid nodules are common extra-articular manifestations.
• Urinary bladder involvement is exceptionally rare.

Observation:

• A 49-year-old female patient with seropositive rheumatoid arthritis presented with hematuria.
• Cystoscopic examination revealed a bladder lesion mimicking carcinoma.
• The lesion was surgically resected for evaluation.

Findings:

• Microscopic examination confirmed the lesion as a rheumatoid nodule.
• This represents the first reported instance of a rheumatoid nodule in the urinary bladder.
• The nodule's histological features were consistent with rheumatoid disease.

Implications:

• This case expands the known spectrum of rheumatoid arthritis manifestations.
• It underscores the importance of considering rheumatoid nodules in bladder lesions, especially in RA patients.
• Further research may explore the pathogenesis and diagnostic challenges of such rare presentations.