PMC5843973_01
T2-weighted coronal magnetic resonance images. (a) The cystic lesion (black arrow) located in the third ventricle caused obstructive hydrocephalus with asymmetrical enlargement of the ventricles. (b) Preoperative image showing the asymmetrical enlargement of ventricles was resolved but the enlargement of ventricles remained because of previous protrusion of the cyst into the left lateral ventricle regressed into the third ventricle (white arrow). (c) Postoperative image revealing the ventricular size decreased
SNI-9-47-g001.jpg
PMC5843973_01_SNI-9-47-g001.jpg
F1
MRI revealed unilateral obstructive hydrocephalus with enlargement of the cyst, which occluded the foramen of Monro and protruded into the left lateral ventricle [Figure 1a]. However, the ventricles still remained enlarged [Figure 1b]. MRI revealed the ventricles were reduced in size compared to preoperatively [Figure 1c].
Operative findings. (a) The cyst arising from the third ventricle and protruding into the left foramen of Monro. (b) A slight gap between the cyst wall and the edge of the foramen of Monro (black arrow). (c) The cyst adhered to the choroid plexus at the edge of the foramen of Monro (black arrow). d) The cyst decreased in size after surgery, confirming the bottom of the third ventricle
SNI-9-47-g002.jpg
PMC5843973_01_SNI-9-47-g002.jpg
F2
The cystic lesion occupied the enlarged foramen of Monro [Figure 2a]. Monro [Figure 2b]. Most of the cyst wall could be easily removed using endoscopic forceps, but the small part of the cyst wall was tightly adhered to the choroid plexus and was left untouched [Figure 2c]. Finally, near-total resection was achieved to recover the physiological CSF flow through the foramen of Monro [Figure 2d].
Hematoxylin and eosin staining shows cuboidal epithelium lining with the collagen tissue, leading to the diagnosis of choroid plexus cyst
SNI-9-47-g003.jpg
PMC5843973_01_SNI-9-47-g003.jpg
F3
Upon pathological examination of the surgical specimen, cuboidal epithelia lined with connective tissue were found in papillary patterns with some calcification and no malignant appearances [Figure 3].