Relapsing polychondritis in children: A review

Relapsing polychondritis: clinical updates and new differential diagnoses

Relapsing polychondritis is a rare inflammatory disease characterized by recurrent inflammation of cartilaginous structures, mainly of the ears, nose and respiratory tract, with a broad spectrum of accompanying systemic features. Despite its rarity, prompt recognition and accurate diagnosis of relapsing polychondritis is crucial for appropriate management and optimal outcomes. Our understanding of relapsing polychondritis has changed markedly in the past couple of years with the identification of three distinct patient clusters that have different clinical manifestations and prognostic outcomes. With the progress of pangenomic sequencing and the discovery of new somatic and monogenic autoinflammatory diseases, new differential diagnoses have emerged, notably the vacuoles, E1 enzyme, X-linked, autoinflammatory, somatic (VEXAS) syndrome, autoinflammatory diseases and immune checkpoint inhibitor-related adverse events. In this Review, we present a detailed update of the newly identified clusters and highlight red flags that should raise suspicion of these alternative diagnoses. The identification of these different clusters and mimickers has a direct impact on the management, follow-up and prognosis of patients with relapsing polychondritis and autoinflammatory syndromes.

Relapsing Polychondritis with Tracheobronchial Involvement: A Detailed Description of Two Pediatric Cases and Review of the Literature

Relapsing polychondritis (RP) is a rare immune-mediated disease that primarily affects the cartilaginous structures of the ears, nose and airways. The clinical spectrum ranges from mild to severe disease characterized by progressive destruction of cartilage in the tracheobronchial tree leading to airway obstruction and acute respiratory failure. Early diagnosis is crucial to prevent irreversible airway damage and life-threatening complications. Due to its rarity and variability of symptoms, the diagnosis of RP is often delayed particularly in childhood. To address this and increase awareness of this rare disease, we present a detailed case report of two adolescent females affected by RP. We aim to describe the clinical findings, consequences of a delayed diagnosis and provide a review of the current literature.

Pediatric-Onset Relapsing Polychondritis With Otolaryngeal Manifestations

Relapsing polychondritis (RP) is a rare autoimmune disease that can present with various clinical manifestations. Among the affected sites, the ear, nose, and throat cartilages are frequently involved, often leading to subtle and episodic symptoms that can be challenging to diagnose. A high index of suspicion is necessary for the early identification of these subtle signs, which can aid in early diagnosis and prompt management. In this report, we present a rare case of pediatric-onset relapsing polychondritis that was initially misdiagnosed as laryngotracheobronchitis.

Positron Emission Tomography Imaging in Vasculitis

Systemic vasculitides comprise a group of autoimmune diseases affecting blood vessels. [18F]-fluoro-2-deoxy-d-glucose positron emission tomography/computed tomography (FDG-PET/CT) plays an important role in the diagnosis and therapeutic monitoring of vasculitides affecting large-sized and medium-sized vessels. FDG-PET/CT also provides complementary information to other vascular imaging tools. The resolution and sensitivity of newer generation scanners continues to increase, hereby improving the ability of FDG-PET/CT to accurately assess the full disease extent in patients with vasculitis. Novel tracers targeting specific immune cells will allow for more detailed detection of vascular infiltrates.

Biologic therapy in relapsing polychondritis: navigating between options

INTRODUCTION

Relapsing polychondritis (RP) is a rare systemic inflammatory disease of unknown etiology, primarily affecting cartilaginous tissue and proteoglycan-rich structures. Clinical manifestations vary from mild symptoms to occasional organ or life-threatening complications. Treatment can be challenging and is mostly based on experience or case reports/series.

AREAS COVERED

There is growing literature investigating the role of biologics in the management of RP. TNFα antagonists, abatacept, tocilizumab, rituximab, anakinra and tofacitinib have been prescribed in several RP patients, mainly as second-line treatment, after conventional immunosuppressive agents' failure.

EXPERT OPINION

: Glucocorticoids represent the gold standard treatment of RP. Conventional immunosuppressants should be administered in refractory patients or when a glucocorticoid-sparing effect is needed. Biologic therapy should be used after failure of conventional treatments or in severe manifestations. TNFα inhibitors are the most prescribed biologic agent, with partial or complete response in several cases; but loss of efficacy may occur over time. Infliximab and adalimumab should be preferred among TNFα antagonists. Abatacept and tocilizumab proved to be effective as second-line biologic agents, but frequent infections are reported with the former. Data on anakinra and rituximab are controversial, therefore they are not recommended as first-line biologic drugs. The use of JAK inhibitors is still anecdotal.

Coexistence of Relapsing Polychondritis and Sickle Cell Disease in a Child

Relapsing polychondritis (RP) is a rare, severe connective tissue disease of unknown etiology affecting cartilaginous and proteoglycan-rich structures in an episodic and inflammatory manner. Approximately a third of RP cases occur in conjunction with another disease usually systemic autoimmune rheumatic disease, or myelodysplastic syndrome. Sickle cell disease (SCD) is a common inherited hematologic condition characterized by the inheritance of two abnormal hemoglobins, of which one is a hemoglobin S, presenting with severe acute and chronic complications from vaso-occlusive phenomena, which can be difficult to differentiate from RP. The pathogenesis of RP is poorly understood but suggests an autoimmune mechanism with a link to sickle cell disease yet to be established. Treatment is empiric with steroids, anti-inflammatory, and disease-modifying antirheumatic drugs being the mainstay of therapy. Severe complications occur despite treatment, with respiratory involvement being the most catastrophic. This case report reviews a complex case of RP in an 11-year-old girl with sickle cell disease (SF genotype) presenting with bilateral red painful eyes, a painful swollen left ear, and knee pain. Laboratory findings revealed elevated inflammatory markers with negative immune serology. A diagnosis of RP was made based on the patient's symptomatology, presentation, and fulfillment of 5 out of the 6 clinical features using McAdam's criteria. Management was instituted with a myriad of conventional and biologic DMARDs and other anti-inflammatory medications with no significant improvement and the development of complications of airway obstruction from disease activity and osteoporotic fracture from steroid therapy and underlying hemoglobinopathy. In children, the diagnosis of RP is delayed or overlooked due to its low incidence, variability in clinical symptoms, or sharing similar clinical features with other coexisting disease entities. This article reports its occurrence in the pediatric population and highlights the difficulty in managing such cases as there are no defined standard treatment protocols.

Treatment of auricular relapsing polychondritis in a Saudi child using only non-steroidal anti-inflammatory drugs: a case report

Relapsing polychondritis (RP) is an autoimmune disease that can involve multiple sites within the human body. It is characterized by recurrent bouts of painful cartilage inflammation, and it can cause severe complications if it affects the vital organs. This report describes the case of a five-year-old child with limited auricular RP. The patient's history was obtained from his family, and a physical examination was performed at a pediatric rheumatology clinic. The patient was successfully treated using only a non-steroidal anti-inflammatory drug, and he completely recovered. This treatment and recovery have not been reported in the literature. Therefore, these results are worthy of mention in order to avoid the use of immunosuppressant medications with localized involvement.