Fetal intracranial hemorrhage is a rare sonographic finding. Due to the subtle and variable nature of hemorrhage on sonography, prenatal diagnosis of intracranial hemorrhage is difficult. Subependymal hemorrhage of the germinal matrix is the least severe form of intracranial hemorrhage. Knowledge of the sonographic appearances of intracranial hemorrhage can make prenatal diagnosis possible and is essential to protecting the neurodevelopmental outcome of the fetus.

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Chiari III malformation is the most rare and severe form of the four types of Chiari malformations. It is characterized by a high cervical meningoencephalocele and caudal displacement of the cerebellum and brainstem. The encephalocele may contain cerebellum, brainstem, cerebrospinal fluid, and rarely the occipital lobe. This case describes a fetus with a large posterior occipitocervical encephalocele diagnosed by sonography at 21 weeks' gestation. We believe this is the first reported Chiari III malformation diagnosed prenatally by sonography alone, as well as the first to describe the diagnosis using 3D sonography.

Heterotopia of the thyroid gland is veryuncommon. Ectopic thyroid results from embryologicaberration characterized by the existence ofthyroid tissue in a site other than its usual locationanterior to the trachea. Ectopic thyroid tissue isusually found along the path of initial descent ofthe thyroid, representing a failure of the thyroidto descend completely. Thyroid ectopia mayalso be found in locations other than the typicalpathway of embryologic descent. It is importantto consider ectopic thyroid as a differentialdiagnosis when a mass is discovered in the neck,chest, or, rarely, other locations.