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. 2021 Aug;278(8):2883-2890.
doi: 10.1007/s00405-020-06564-w. Epub 2021 Jan 4.

Sinonasal IgG4-related disease: a rare and emerging entity broadening the differential diagnosis in the sinonasal universe

Kanwalpreet Kaur  1 , Aanchal Kakkar  2 , Smita Manchanda  3 , Puja Chatterjee  4 , Harpreet Kaur  5 , Deepika Mishra  5 , Hitesh Verma  4 , Rajeev Kumar  4 , Prem Sagar  4 , Deepali Jain  1 , Ashu Seith Bhalla  3
Affiliations

Sinonasal IgG4-related disease: a rare and emerging entity broadening the differential diagnosis in the sinonasal universe

Kanwalpreet Kaur et al. Eur Arch Otorhinolaryngol. 2021 Aug.

Abstract

Background: IgG4-related disease (IgG4-RD) is a multi-organ immune-mediated disorder characterized by fibroinflammatory mass-forming lesions, mimicking malignancy or infection. While well-documented in salivary glands, orbit and thyroid in the head and neck, sinonasal IgG4-RD is rare.

Methods: Cases of sinonasal IgG4-RD were retrieved, and clinicopathological features reviewed.

Results: Seven cases of sinonasal IgG4-RD were identified over a 2-year period, including three males and four females, with an age range of 13-48 years (median: 32 years). Patients presented with cheek swelling, pain and visual disturbances. Serum IgG4 levels were mildly elevated. Storiform fibrosis, obliterative phlebitis and plasma cell infiltration were seen in varying proportions. Destruction of bone and subepithelial mucoserous glands was present. ALK-1 negativity distinguished from inflammatory myofibroblastic tumor.

Conclusion: Sinonasal IgG4-RD expands the growing spectrum of IgG4-RD. A high degree of suspicion is required to include IgG4-RD in differential diagnosis of sinonasal masses, and perform detailed histological and immunohistochemical workup for accurate diagnosis.

Keywords: Obliterative phlebitis; Paranasal sinus; Plasma cells; Pseudotumor; Storiform fibrosis.

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