CLINICAL IMAGAGINGAN ATLAS OF DIFFERENTIAL DAIGNOSISEISENBERG

1. 26Midline Congenital
Anomalies on Ultrasonography

2. CLINICAL IMAGAGING
AN ATLAS OF DIFFERENTIAL DAIGNOSIS
EISENBERG
DR. Muhammad Bin Zulfiqar
PGR-FCPS III SIMS/SHL

3. • Fig SK 26-1 Vein of Galen malformation. (A)
Coronal sonogram shows the large vein of Galen
(VG) lying between the dilated lateral ventricles
(LV). Note the parenchymal atrophy, seen as
hypoechoic areas above the vein of Galen. (B) On
the sagittal image, the dilated vein of Galen can
be followed posteriorly into the straight sinus (S)
and the torcular Herophili (TH).43

4. • Fig SK 26-2 Chiari II malformation. Sagittal
sonogram shows the cerebellum (C) and fourth
ventricle situated low in the posterior fossa and
obliteration of the cisterna magna. An enlarged
massa intermedia (M) partially fills the third
ventricle (3).43

5. • Fig SK 26-3 Dandy-Walker syndrome. (A) Sagittal
sonogram demonstrates such characteristic features as
a posterior fossa cyst (CY) representing the ballooned
fourth ventricle and partial or complete absence of the
vermis. The often huge cyst displaces the cerebellum
(C) and tentorium (arrows) superiorly. (B) Posterior
coronal image shows the large cyst (CY) filling the
posterior fossa.4.3

6. • Fig SK 26-4 Dandy-Walker variant. Sonogram
through the posterior fontanelle demonstrates
a large cyst (CY) and fourth ventricle (4),
connected by a narrow vallecula (arrow).43

7. • Fig SK 26-5 Agenesis of corpus callosum.
Coronal sonogram shows separation of the
frontal horns (FH), which have concave medial
borders.43

8. • Fig SK 26-6 Intracerebral lipoma with absent
corpus callosum. Coronal sonogram shows an
echogenic area (arrows) superior and to the
left of the elevated third ventricle (3).43

9. Fig SK 26-7 Alobar holoprosencephaly. Posterior coronal
sonogram demonstrates the single ventricle (V) and the fused
thalami (T).43