A Case of Eosinophilic Sialodochitis with Right Submandibular Sialolithiasis and Hyperdense Material along Wharton’s Duct

Background and Clinical Significance: Eosinophilic sialodochitis (ES), also known as sialodochitis fibrinosa, is a rare disorder characterized by recurrent salivary gland swelling caused by intraductal eosinophilic mucous plugs. Typical histopathological findings include eosinophils and Charcot–Leyden crystals within ductal secretions, and characteristic imaging findings include salivary duct dilatation and glandular swelling. Although rare cases associated with sialolithiasis or calcification have been reported, high-attenuation material within the salivary duct on computed tomography (CT) has not been clearly described in ES. Case Presentation: A 56-year-old woman with allergic rhinitis presented with recurrent swelling and pain in the right submandibular area. CT and ultrasonography revealed a large sialolith in the right submandibular gland and dilatation of Wharton’s duct. She underwent right submandibular gland excision for presumed chronic submandibular sialadenitis with a sialolith. Soon after surgery, she developed recurrent swelling of the right floor of the mouth, and CT showed persistent high-attenuation material along Wharton’s duct without residual sialolith. Ductal mas-sage discharged a brownish gelatinous material. Histopathological examination revealed numerous eosinophils and Charcot–Leyden crystals in both the discharged mucous plug and decalcified sialolith, fulfilling Baer’s diagnostic criteria for ES. Physical extraction and anti-allergic medications were insufficient, whereas ductal irrigation with saline and triamcinolone acetonide markedly reduced mucous plug discharge. Symptoms were controlled during 18 months of follow-up. Conclusions: Retained eosinophilic mucin in ES may appear as high-attenuation ductal material on CT and contribute to salivary stasis and sialolith formation.