Periventricular grey matter heterotopia

Case contributed by Frank Gaillard


Unconscious collapse lasting 30 seconds.

Patient Data

Age: 20 years
Gender: Male

CT brain


Non contrast CT demonstrates a nodule of tissue bulging into the left lateral ventricle with density similar to grey matter. 

MRI brain


MRI demonstrates a 15 x 8 x 10 mm nodule which projects into the trigone of the left lateral ventricle. It has signal characteristics which match those of cortex on all sequences and demonstrates no abnormal contrast enhancement. There is no convincing abnormality of the overlying cortex.

Incidental note is made of a small pineal cyst which measures 10 mm in maximal diameter. No abnormal contrast enhancement. 

Case Discussion

CT and MRI demonstrate typical appearances of an isolated and sporadic nodule of periventricular grey matter heterotopia. 

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