Cerebral toxoplasmosis

Case contributed by Dr Ian Bickle


Fever and URTI for the past 2 weeks. Frequent infections prior 2 months. Right LMN facial palsy. Tandem gait. Newly diagnosed immunosupressive disease

Patient Data

Age: 30
Gender: Male

Ill defined non-enhancing low attenuation in the left lentiform nucleus and internal capsule,

Similar ill defined area of low attenuation in the left posterior parietal lobe, including the post central gyrus.

No abnormal enhancement.


Multiple lesions of variable size measuring from 9 to 25mm with surrounding oedema throughout the brain including, cerebral hemispheres, cerebellum and brain stem. The lesions are hyper intense on T2 and involving the subcortical regions, white matter and basal ganglia. The largest one is in the left basal ganglia.  Several have low T2 signal rims.

Focal areas of restricted diffusion in a few lesions in the parietal lobe. No intra-lesional calcification.

Variable enhancement with faint ring enhancement of a minority of the lesions.

Normal paranasal sinuses.

Mastoids are normal and the calvarium demonstrates no abnormality.


A follow up MRI was performed 9 weeks after treatment

Comparison was made with the previous MRI brain from 9 weeks prior.

The multiple supratentorial and infratentorial T2W and TIRM hyperinetnse lesions have markedly decreased in number and size.  The largest residual lesion in the left lentiform nucleus is 5mm.  Minor residual rim enhancement.

No new lesions.

Case Discussion

This is a case of proven cerebral toxoplasmosis with clinical and radiological follow up.  This was the patient's presentation with previously unknown HIV.

The serum titres for Toxoplasma gondii were elevted at 650 IU/l mL.

The CD4 count on admission was 4.    HIV serology came back as positive.


PlayAdd to Share

Case information

rID: 53993
Published: 30th Aug 2017
Last edited: 30th Jan 2018
Inclusion in quiz mode: Included

Updating… Please wait.

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.