What question did this study set out to answer?

To describe a rare case of sialoceles in a dog presenting with mediastinal masses and pleural effusion.

April 25, 2026Journal of Veterinary Medical Science0 citationsOpen Access

A case report of multiple cervical and mediastinal sialoceles in a dog: a rare differential for mediastinal masses with pleural effusion

JHJeong-Ho HAKangwon National University SCSooyoung ChoiSeoul National University JAJin-Ok AHNKangwon National University

Key Points

To describe a rare case of sialoceles in a dog presenting with mediastinal masses and pleural effusion.
Case report detailing imaging findings through radiography, ultrasonography, and computed tomography.
Cytologic analysis of pleural fluid was conducted to determine the nature of the masses.
Pleural effusion was drained and monitored radiographically.
Multiple lesions identified in cervical and cranial mediastinal regions regressed with conservative management.
Cytology indicated a salivary origin for the pleural fluid, suggesting sialoceles as a potential diagnosis.
There was no need for surgical intervention, as all lesions resolved over time.

Abstract

Mediastinal masses with pleural effusion in dogs typically raise suspicion for thymoma or mediastinal lymphoma, necessitating careful differentiation. This paper describes a 12-year-old neutered male dog presenting with acute-onset coughing. Radiographic imaging revealed mild pleural effusion with an expanded cranial mediastinum. Subsequent ultrasonographic and computed tomographic examinations identified multiple masses extending from the cervical region to the cranial mediastinum. Cytologic analysis of the pleural fluid revealed findings suggestive of a salivary origin, with mild inflammatory cell infiltration. The pleural effusion was repeatedly drained and monitored radiographically. All lesions regressed gradually without surgical intervention. This rare case highlights the need to consider differential diagnoses beyond thymoma and lymphoma when mediastinal masses with pleural effusion are present.

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