Fibroblastic rheumatism (FR) is a rare fibroproliferative disease with an unknown etiology. The absence of typical symptoms makes early diagnosis challenging. This study aims to systematically review FR cases and present a case from our center to provide a comprehensive description of the clinical manifestations, diagnosis, and treatment, thereby assisting clinicians in early identification and timely management of FR, ultimately leading to improved prognosis.

FR is a rare fibroproliferative disease with an unknown etiology. It is characterized by rapidly progressive and destructive symmetrical inflammatory multiple arthritis. Here, we present a rare case of a 50-year-old female with symmetric inflammatory polyarthritis. We highlight the importance of a comprehensive medical history, histopathology, immunohistochemistry, and clinical manifestations of skin nodules, arthralgia, and arthritis for successful disease diagnosis. Despite employing non-steroidal anti-inflammatory drugs, corticosteroids, methotrexate, and tacrolimus, the patient's symptoms did not resolve, and joint destruction continued to progress. Early diagnosis, aggressive treatment with appropriate use of steroids and immunosuppressants, and further research to identify effective treatment strategies are crucial in preventing detrimental joint destruction and limb contractures.

A comprehensive review of the available literature emphasizes the importance of early and accurate diagnosis coupled with appropriate treatment for achieving favorable outcomes and preventing joint destruction and limb contractures.

Fibroblastic rheumatism (FR) is an uncommon disease of the skin, characterized by the presence of non-tender cutaneous nodules accompanied often by other rheumatic manifestations. This condition shows male predominance, no age preference and unpredictable course, resulting frequently in permanent joint damage. A 60-year-old man came to our department with a 4-year history of multiple non-tender nodules and morning stiffness affecting mainly the upper extremities. Clinical examination revealed arthritis of the hands, confirmed by imaging tests. Laboratory exams were unremarkable. A skin nodule biopsy showed a dermal collagenous lesion with myxoid areas composed of spindle and stellate cells. Immunohistochemical staining demonstrated positivity for CD68 and negativity for CD34, S100, EMA and desmine. FR was diagnosed and the patient started methylprednisolone 16 mg/day. Hydroxychloroquine 400 mg/day and methotrexate 15 mg/weekly were further added as steroid-sparing agents with clinical benefit. Clinicians should be aware of this underreported entity, which can rapidly lead to irreversible deformities.