A 20-year-old patient presents with a soft, compressible, brilliantly transilluminant, non-tender swelling in the submental (anterior neck) region. The swelling has been present since childhood and has gradually increased in size over the past 2 years.
What is the most likely clinical diagnosis?
Decoding the Stem
Explanation
B. Cystic hygroma: ✅ Correct. It is a congenital lymphatic malformation, most commonly found in the neck. Key exam features are its soft, compressible nature and brilliant transillumination because it contains clear lymphatic fluid.
A. Lymph nodes: ❌ Incorrect. Enlarged nodes are usually firm and do not transilluminate.
C. Metastatic SCC: ❌ Incorrect. Typically hard, fixed, and occurs in older patients with a smoking/alcohol history.
D. Infected sebaceous cyst: Incorrect. These are painful, erythematous, and may have a central punctum; they do not transilluminate.
E. Thyroglossal cyst: Incorrect. While it is a childhood midline swelling, it typically moves upward with tongue protrusion and swallowing. It is usually not as "brilliantly" transilluminant or compressible as a cystic hygroma.
🧠Cystic Hygroma Summary
| Feature | Details |
|---|---|
| Etiology | Sequestration of jugular lymphatic sacs |
| Fluid Type | Clear lymphatic fluid |
| Classic Sign | Brilliant Transillumination |
| Common Site | Posterior Triangle of Neck (75%) |
Integrated Clinical Questions
1. Where is the most common anatomical site for a cystic hygroma?
2. Which genetic condition is most commonly associated with cystic hygroma in utero?
3. What are the primary treatment options for this condition?
4. How can you clinically differentiate a cystic hygroma from a thyroglossal cyst?
5. Why might a cystic hygroma suddenly increase in size?
⚡ Exam Pearls
- Cystic Hygroma: Soft + Compressible + Brilliant Transillumination.
- Age: Usually present at birth or by age 2.
- Imaging: Ultrasound shows a multilocular cystic mass with thin septations.
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