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Print ISSN: 1792-0981 Online ISSN: 1792-1015
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January-2026 Volume 31 Issue 1

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Case Report Open Access

Chronic maxillary sinusitis masquerading as a maxillary sinus neoplasm: A case report

  • Authors:
    • Ji-Hyeon Oh
    • Seong-Gon Kim
    • Su-Young Kim
  • View Affiliations / Copyright

    Affiliations: Department of Oral and Maxillofacial Surgery, College of Dentistry, Gangneung‑Wonju National University, Gangneung, Gangwon 25457, Republic of Korea
    Copyright: © Oh et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 16
    |
    Published online on: November 4, 2025
       https://doi.org/10.3892/etm.2025.13011
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Abstract

Chronic inflammatory diseases of the maxillary sinus can present well‑defined, expansile radiolucent features, necessitating differential diagnosis from true neoplasms. Pleomorphic adenoma, although rare, is one of the neoplasms included in the list of differential diagnoses, and it may occasionally arise in the maxillary sinus. However, inflammatory conditions such as mucoceles, postoperative maxillary cysts and chronic bacterial maxillary sinusitis can also cause thinning and expansion of the sinus walls due to prolonged obstruction. The present study describes a case of chronic maxillary sinusitis masquerading as a neoplasm in a 53‑year‑old man. Although the lesion was initially diagnosed as pleomorphic adenoma on incisional biopsy, histopathological examination of the entire lesion ultimately revealed it to be chronic maxillary sinusitis.
View Figures

Figure 1

Preoperative cone-beam computed
tomography images showing a large, expansile mass with smooth
margins. The lesion is radiolucent and lacks septa or a fluid
level. (A) Coronal view. (B) Three-dimensional reconstructed
image.

Figure 2

Intraoperative clinical photograph of
the lesion.

Figure 3

Histopathologic features of the
lesion. (A) Chronically inflamed respiratory mucosa showing
granulation tissue and fibrosis. (B) Cholesterol clefts within the
lesion (hematoxylin and eosin staining; scale bar, 50 µm).

Figure 4

Coronal view of cone-beam computed
tomography performed 6 months postoperatively, showing no signs of
recurrence.
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Copy and paste a formatted citation
Spandidos Publications style
Oh J, Kim S and Kim S: Chronic maxillary sinusitis masquerading as a maxillary sinus neoplasm: A case report. Exp Ther Med 31: 16, 2026.
APA
Oh, J., Kim, S., & Kim, S. (2026). Chronic maxillary sinusitis masquerading as a maxillary sinus neoplasm: A case report. Experimental and Therapeutic Medicine, 31, 16. https://doi.org/10.3892/etm.2025.13011
MLA
Oh, J., Kim, S., Kim, S."Chronic maxillary sinusitis masquerading as a maxillary sinus neoplasm: A case report". Experimental and Therapeutic Medicine 31.1 (2026): 16.
Chicago
Oh, J., Kim, S., Kim, S."Chronic maxillary sinusitis masquerading as a maxillary sinus neoplasm: A case report". Experimental and Therapeutic Medicine 31, no. 1 (2026): 16. https://doi.org/10.3892/etm.2025.13011
Copy and paste a formatted citation
x
Spandidos Publications style
Oh J, Kim S and Kim S: Chronic maxillary sinusitis masquerading as a maxillary sinus neoplasm: A case report. Exp Ther Med 31: 16, 2026.
APA
Oh, J., Kim, S., & Kim, S. (2026). Chronic maxillary sinusitis masquerading as a maxillary sinus neoplasm: A case report. Experimental and Therapeutic Medicine, 31, 16. https://doi.org/10.3892/etm.2025.13011
MLA
Oh, J., Kim, S., Kim, S."Chronic maxillary sinusitis masquerading as a maxillary sinus neoplasm: A case report". Experimental and Therapeutic Medicine 31.1 (2026): 16.
Chicago
Oh, J., Kim, S., Kim, S."Chronic maxillary sinusitis masquerading as a maxillary sinus neoplasm: A case report". Experimental and Therapeutic Medicine 31, no. 1 (2026): 16. https://doi.org/10.3892/etm.2025.13011
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