Medknow Publications on behalf of the Neurological Society of India
Abstract
We describe the magnetic resonance imaging (MRI) signal characteristics
of isolated (solitary lesion) intra fourth ventricular cysticercus cyst
in 4 patients who clinically presented with obstructive hydrocephalus.
All patients had routine MRI sequences (T1, T2, & proton
density-weighted imaging), Fluid Attenuation Inversion Recovery
(FLAIR), and post-gadolinium imaging followed by cerebrospinal fluid
(CSF) flow study. It revealed a CSF signal intensity (on all pulse
sequences), intra fourth ventricular cyst with a nidus (scolex), and
wall enhancement. On T1-weighted and FLAIR images, the cyst wall and
nidus (scolex) were seen in 3 cases, which were not seen in other
routine sequences. The CSF flow study showed the intraluminal nature of
the cyst. The MRI features suspected a cysticercus cyst, and
per-operative findings and histopathological examination confirmed the
diagnosis. The review of literature of the intra fourth ventricular
cyst is briefly discussed
