Neonatal Submandibular Sialadenitis Without Abscess Formation: A Rare Cause of Neck Swelling.

Acute neonatal sialadenitis is a rare condition, most commonly involving the parotid gland, whereas isolated submandibular gland involvement is uncommon and may pose diagnostic challenges. We report the case of a two-week-old term male infant who presented with right submandibular swelling in the absence of fever, systemic signs of infection, or abscess formation. Laboratory evaluation revealed leukocytosis with elevated inflammatory markers, and ultrasound imaging confirmed acute submandibular sialadenitis. The infant responded well to intravenous antibiotics without the need for surgical intervention. This case highlights the clinical variability of neonatal sialadenitis and emphasizes the importance of early recognition, appropriate imaging, and targeted antimicrobial therapy to prevent complications.