Cystic hygroma vs. occipital meningocoele
Cystic hygroma and occipital meningocoele are both differential diagnosis for an antenatally detected cystic collection noted on the posterior aspect of the head and neck.
A simple differentiation can be made based on the contents and presence of septations:
- cystic hygroma will present as well defined anechoic thin walled cyst with multiple septations and a characteristic midline septation representing the nuchal ligament
- an occipital meningocoele will appear as a well defined anechoic area with no septations and is seen in direct continuity with a defect in the calvarium