The scrotum is a rare site to find a rheumatoid nodule.
Clinical features:
(1) The patient has a history of rheumatoid arthritis.
(2) The patient develops a scrotal nodule.
(3) The mass has an ill-defined margin with high signal intensity on T2-weighted scans.
(4) Biopsy of the mass shows a necrobiotic granuloma.
(5) The patient may have rheumatoid nodules elsewhere or a history of rheumatoid nodules.
Differential diagnosis:
(1) carcinoma
(2) syphilis
(3) tuberculosis
Rheumatoid nodules can rarely ulcerate, which may increase the suspicion for malignancy or syphilis.
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Specialty: Urology, Immunology/Rheumatology
