The child in the image presents with bilateral facial swelling. Clinically, this swelling is often painful and associated with fever. Which of the following is the most likely diagnosis?

Explanation

## Image Findings * **Bilateral, diffuse swelling** of the parotid regions, extending from the pre-auricular area to the angle of the mandible. * The swelling gives the child's face a characteristic **"chipmunk" or "puffy" appearance**. * Mild erythema over the swollen areas. * The child appears to be in the typical age group for common childhood infections. ## Diagnosis **Key Point:** The image demonstrates **bilateral parotid gland swelling**, which is pathognomonic for mumps parotitis in the appropriate clinical context. Mumps is an acute viral illness caused by the **mumps virus**, a paramyxovirus. It is characterized by **non-suppurative inflammation of the salivary glands**, most commonly the parotid glands. The swelling is typically bilateral (as seen here) but can be unilateral, and is often painful and tender. Associated symptoms include fever, headache, malaise, and myalgia. ## Differential Diagnosis | Feature | Mumps Parotitis | Bilateral Submandibular Sialadenitis | Angioedema | Nephrotic Syndrome | | :------------------ | :------------------------------------------------ | :------------------------------------------------ | :---------------------------------------------- | :------------------------------------------------ | | **Swelling Location** | Pre-auricular, angle of mandible, pushes earlobe up and out | Below the jawline, in the submandibular triangle | Lips, eyelids, tongue, generalized facial swelling | Periorbital, generalized pitting edema | | **Nature of Swelling** | Diffuse, firm, glandular, often bilateral | Firm, glandular, localized to submandibular area | Rapid onset, non-pitting, non-pruritic | Pitting, generalized, often worse in morning | | **Associated Symptoms** | Fever, malaise, headache, orchitis, pancreatitis | Fever, pain, often associated with stones/infection | Urticaria (if allergic), dyspnea (if airway involved) | Proteinuria, hypoalbuminemia, hyperlipidemia, edema | | **Image Findings** | Bilateral parotid enlargement | Would show swelling primarily below the jawline, not pre-auricular | Would show more lip/eyelid involvement, less distinct glandular swelling | Would show generalized puffiness, especially periorbital, not distinct parotid swelling | ## Clinical Relevance **Clinical Pearl:** Mumps is a vaccine-preventable disease (MMR vaccine). Complications include **orchitis** (most common in post-pubertal males, leading to infertility in some), **meningitis**, **pancreatitis**, and **sensorineural hearing loss**. ## High-Yield for NEET PG **High-Yield:** The most common complication of mumps in post-pubertal males is **orchitis**. The most common neurological complication is **aseptic meningitis**. **Key Point:** Mumps is caused by a **paramyxovirus** and is transmitted via respiratory droplets. Incubation period is 16-18 days. ## Common Traps **Warning:** Do not confuse mumps parotitis with bacterial parotitis (which is usually unilateral, more acutely painful, and often associated with purulent discharge from Stensen's duct) or cervical lymphadenitis (which involves lymph nodes, not salivary glands). ## Reference [cite:Nelson Textbook of Pediatrics, Ch 246, Mumps]