**8.3. Prognosis**

The prognostic thymic cyst is favorable without affecting the condition of the fetus. The pericardial cyst can determine hydrops due to the compression on the heart. However, sometimes even in the case of reduced size, the pericardial cyst can be resorbed. The neurenteric cyst can cause cardiac compression and the appearance of hydrops as secondary effect. The esophageal duplication cyst determines polyhidramnios due to compression on the esophagus. The risk of chromosomal anomalies is absent, so karyotyping is not recommended.

#### **8.4. Prenatal management**

The indication of in utero treatment is represented by the presence of hydrops and the presence of compression of the tracheobronchial tree [44]. Puncture with cyst aspiration or the EXIT techniques are the treatment options in such cases.
