? DANDY WALKER VARIANT

CT scan brain showing dilatation of fourth ventricle ..
??dandy walker variant


Dandy-Walker malformation is a rare congenital malformation that involves the cerebellum and fourth ventricle.
Dandy-Walker malformation is characterized by

1. agenesis or hypoplasia of the cerebellar vermis
2. cystic dilatation of the fourth ventricle
3. enlargement of the posterior fossa

A large number of concomitant problems may be present, but Dandy-Walker malformation is recognized whenever these 3 features are found

Dandy-Walker complex is characterized by

1. an enlarged posterior fossa
2. a high position of the tentorium, with upward displacement of the lateral sinuses
3. torcular herophili associated with varying degrees of vermian aplasia or hypoplasia
4. a cystic dilatation of the fourth ventricle that nearly fills the entire posterior fossa.

Dandy-Walker variant consists of vermian hypoplasia and cystic dilatation of the fourth ventricle, without enlargement of the posterior fossa.

?GLIOBASTOMA MULTIFORME

CT scan brain....(with contrast)

a heterogenous density mass iss seen in the right frontal and peri ventricular region .

there is significant mass effect on the ibsilateral lateral ventricle and midline shift.

there is perilesional edema ..seen as hypodense area surrounding the mass....

Bone window reveals erosion of both inner and outer table of overlying bone

there is marginal enhancement of the mass.

ASO...

?glioblastoma multiforme

?? metastasis

SPALDING'S SIGN

In intrauterine maceration, the skull vault bones may partly overlap each other.

This is called as Spalding’s sign . It is also detectable by X Ray examination before the birth of the dead fetus .