Which statement about the lateral swelling with pain on swallowing suggests infection of which structure?

Correct answer: C. Submandibular gland

• A. Sublingual gland infection causes floor of mouth swelling.
• B. Parotid gland infection (parotitis) causes swelling anterior to the ear and over the ramus — not lateral neck swelling with dysphagia.
• C. Correct. Lateral neck swelling combined with pain on swallowing (dysphagia) is classic for SUBMANDIBULAR GLAND INFECTION (submandibular sialadenitis). The submandibular gland is located in the submandibular triangle and when infected causes swelling under the chin/lateral neck area and pain with swallowing due to proximity to the floor of mouth.
• D. Thyroid gland infection would cause anterior midline neck swelling — not lateral neck swelling with salivary gland symptoms.