Current clinical and therapeutic approach to tumour-like mass lesions in granulomatosis with polyangiitis

Cutting-Edge Strategies for Renal Tumour-like Lesions in Granulomatosis with Polyangiitis: A Systematic Review

BACKGROUND

Granulomatosis with polyangiitis (GPA) is characterised by granulomatous inflammation and small-to-medium vessel necrotising vasculitis, mainly affecting respiratory tract and kidneys. Renal involvement presenting as tumour-like lesions poses diagnostic and treatment challenges.

METHODS

Following the observation of a GPA patient presenting with multiple renal tumour-like lesions, we conducted a systematic literature review on MEDLINE/PubMed, EMBASE, and Cochrane databases. Data gathered from the literature were analysed to summarise the diagnostic approach, management, and outcome of renal GPA-related tumour-like lesions.

RESULTS

a 49-year-old female presented with persistent constitutional symptoms and multiple bilateral renal lesions. Renal biopsy showed chronic interstitial inflammation with necrotising granulomas. Laboratory tests disclosed positive anti-proteinase 3 (PR3) anti-neutrophil cytoplasmic antibody (ANCA) leading to a final diagnosis of GPA. She was effectively treated with high-dose glucocorticoids and rituximab. Literature search yielded 41 articles, concerning 42 GPA patients with renal masses, presenting bilaterally in 23.8% of the cases. Positive PR3-ANCA was observed in 86.5% of the cases. Half of 42 patients showed kidney abnormalities. Treatment with glucocorticoids (83.3%) and immunosuppressive agents (80.9%) resulted in an overall good remission rate and favourable prognosis.

CONCLUSIONS

GPA should be considered in the differential diagnoses of kidney tumour-like lesions. The diagnosis is challenging, and histological examination greatly contributes to the diagnostic work-up.

Imaging of Small Artery Vasculitis

Small artery vasculitis of the CNS is a rare and serious condition characterized by the inflammation of blood vessels within the brain and spinal cord. There are two groups of small artery vasculitis determined by the presence or absence of immunoglobulin complex deposition in the vessel wall. The former includes anti-glomerular basement membrane disease, cryoglobulinemic vasculitis, and IgA vasculitis. Absence of immune complex deposition is associated with anti-neutrophil cytoplasmic antibody (ANCA) and includes microscopic polyangiitis, granulomatosis with polyangiitis, eosinophilic granulomatosis with polyangiitis, and primary angiitis of the CNS. These conditions present a diagnostic challenge in which imaging plays a crucial role.

Mass-like Lesions Causing Compression of Large Vessels in Granulomatosis with Polyangiitis

A 69-year-old woman with a history of otitis media with anti-neutrophil cytoplasmic antibody-associated vasculitis who had been receiving corticosteroid monotherapy presented with shortness of breath. The otitis media had been alleviated, but she had saddle nose. Chest enhanced computed tomography showed stenoses of the bronchi and large vessels surrounded by mass-like lesions in the mediastinum. These manifestations indicated an active state of granulomatosis with polyangiitis (GPA). After she was started on high-dose corticosteroids and intravenous cyclophosphamide, the mass-like lesions disappeared with improvements of the stenoses. Ameliorating mass-like lesions resulting from GPA requires therapeutic intervention using corticosteroids and immunosuppressants.

The eye is a common site of granulomatosis with polyangiitis. A collaborative study

BACKGROUND

Ocular manifestations of granulomatosis with polyangiitis (GPA) have been reported in a limited number of studies and with largely variable frequency. Here we report on the clinical, diagnostic, and therapeutic features of a cohort of 63 GPA patients, with particular regard to 22 of them with ophthalmic involvement (35%).

METHODS

Clinical manifestations, results of immunological findings, histopathological pictures, imaging data, Birmingham Vasculitis Activity Score, therapeutic regimens, and outcomes were retrospectively analyzed. At diagnosis, in addition to a structured clinical assessment, all patients underwent a comprehensive ophthalmologic examination.

RESULTS

The most frequently involved organs were kidneys, lungs, ear/nose/throat, and eyes. Ocular manifestations were bilateral in 32%. The three most commonly diagnosed ophthalmologic manifestations were scleritis (36%), retro-orbital pseudotumor or orbital mass (23%), and episcleritis (13%). Ocular and systemic involvement were simultaneously present at onset in 41% of the patients; systemic involvement was followed by ocular lesions in 36%; ocular inflammation was followed by systemic manifestations in 18%; and an orbital mass in the absence of systemic disease characterized 5%. Glucocorticoids plus cyclophosphamide and glucocorticoids plus rituximab were the combined therapies most frequently employed during remission induction and remission maintenance, respectively. Persistent ophthalmologic and extra-ocular remissions were achieved in 77 and 64% of the patients, respectively. One to three systemic relapses were diagnosed in 7 patients (31.8%). At the last follow-up, a visual outcome 20/40 or better in 31 (70%) of 44 eyes was determined.

CONCLUSIONS

The eye was involved in over one third of our patients with GPA. Increased awareness, early diagnosis, and multi-specialty collaboration are critical in achieving a favorable outcome of GPA.

Simultaneous testicle and epididymis vasculitis revealing granulomatosis with polyangiitis

Granulomatosis with polyangiitis (GPA) is a systemic necrotizing granulomatous vasculitis, which predominantly affects small‐sized blood vessels. We aimed to report a case of GPA involving testicles and epididymis taken for malignancy. A 75‐year‐old patient was admitted for a painful left testicular mass. There was no extra urogenital manifestations on examination and the workup was unremarkable. Histological findings after orchidectomy revealed granulomatous inflammation of the testis and epididymis with fibrinoid necrosis and necrotic vasculitis consisting with the diagnosis of GPA. Further investigations regarding ear, nose, throat, pulmonary, and renal involvement were negative. Proteinase 3 antineutrophil cytoplasmic antibodies (PR3‐ANCA) test was negative. Furthermore, infectious diseases especially tuberculosis were ruled out. Based on histopathological findings, limited GPA was diagnosed. The patient was treated with methotrexate and prednisone with good outcome. There was no relapse after 1 year of follow‐up. Isolated urogenital involvement may occur at the onset of GPA and can be taken for malignancy. Histopathological findings are the gold standard for the diagnosis. Treatment is based on steroids and immunosuppressive drugs.

Urogenital manifestations in granulomatosis with polyangiitis can be taken for malignancy when occurring at disease onset. In the absence of other signs or ANCA positivity, histopathological findings are crucial to guide diagnosis.