The images presented show an echogenic, well-circumscribed mass in direct relation with the corpus callosum and the lateral ventricles.

Also we noted mild ventriculomegaly

The first differential diagnosis for this bright echogenic masses should always be intracranial hemorrhage. Indeed, that was the prenatal diagnosis for this baby.

Other differentials for such masses include:

• Teratoma
• Craniopharingioma.
• Primitive neuroectodermal tumors
• Lipoma of the corpus callosum

Less likely, but also in the differential diagnosis list are:

• Glioblastoma multiform
• Medulloblastoma
• Gliomas of the optic bulbs and of the hypothalamus
• Metasatasis of choriocarcinoma
• Astrocytoma
• Fetus-in-fetu.

Pictures from the pathological brain examination show a yellow mass of the corpus callosum which extends to the lateral ventricles

Histological exmination show that this mass was composed by fatty tissue, which confirmed the diagnosis of Lipoma of the corpus callosum or pericallosal lipoma.