Article Figures & Data
Figures
- Fig 1.
A 20-year-old man with headaches and a communicating left middle cranial fossa AC (patient 10).
A, CTC shows homogeneous contrast enhancement in the cyst.
B and C, Transverse (B) and coronal (C) T2-weighted images (TR/TE/NEX, 7400/115/1) obtained before PC cine MR imaging helps in proper section orientation.
D and E, Transverse(D) and coronal (E) PC cine MR images (TR/TE/flip angle, 70/15.8/10°) show hyperintensity (arrows) arising from left chiasmatic cistern, which represents communication with the subarachnoid space.
F, Adjusting the windowing makes the flow jet (arrows) more clear.
- Fig 2.
A 17-year-old male adolescent with convulsions and a left middle cranial fossa noncommunicating AC (patient 33).
A, CTC shows no contrast enhancement on delayed scan.
B, Coronal T2-weighted image (TR/TE/NEX, 7400/115/1) shows the cyst causing a mild midline shift.
C, Coronal PC cine MR image (TR/TE/flip angle, 70/15.8/10°) shows no signal intensity alteration in the cyst (arrows). Cyst and brain have the same signal intensity pattern.
- Fig 3.
A 37-year-old woman with headaches and a communicating quadrigeminal cistern AC (patient 15).
A, CTC performed 2 hours after an intratechal injection of contrast agent shows no enhancement (arrow). Intracystic attenuation was 9 HU.
B, CTC at 12 hours shows mild enhancement (51 HU, arrow).
C, CTC at 24 hours shows clear enhancement (88 HU, arrow).
D and E, Transverse (D) and coronal (E) T2-weighted images (TR/TE/NEX, 7400/115/1).
F, Midsagittal PC cine MR image (TR/TE/flip angle, 70/15.8/10°) shows no evidence of communication (arrow). No signal intensity alterations were seen on transverse and coronal images (not shown).
- Fig 4.
A 66-year-old woman with a type III cyst in the left middle cranial fossa (patient 9).
A, CTC 2 hours after intratechal contrast injection shows no enhancement (8 HU).
B, CTC at 12 hours shows intracystic enhancement of 46 HU.
C and D, Transverse (C) and coronal (D) T2-weighted images (TR/TE/NEX, 7400/115/1) show marked midline shift.
E and F, Transverse (E) and coronal (F) PC cine MR images (TR/TE/flip angle, 70/15.8/10°) shows evidence of a flow jet (arrows), although communication with the cisternal space is unlikely in type III cysts.
Tables
Patient/Age (y)/Sex Location of Arachnoid Cyst Clinical Findings Confirmation Method Communication with CSF* PC Cine MR Imaging CTC Surgery 1/8/M L middle fossa Seizure CTC Yes Yes NA 2/53/F R middle fossa Headache CTC Yes Yes NA 3/27/M L middle fossa Incidental CTC Yes Yes NA 4/14/M L middle fossa Headache CTC Yes Yes NA 5/16/M L middle fossa Headache CTC Yes Yes NA 6/26/F L middle fossa Headache CTC Yes Yes NA 7/15/M R middle fossa Headache CTC Yes Yes NA 8/49/M R cerebellopontine angle Vertigo CTC Yes Yes NA 9/66/F L middle fossa Headache CTC Yes Yes NA 10/20/M L middle fossa Headache CTC Yes Yes NA 11/22/M R middle fossa Headache CTC Yes Yes NA 12/50/F L middle fossa Headache CTC Yes Yes NA 13/10/F R middle fossa Headache CTC No Yes NA 14/42/M L middle fossa Incidental CTC No Yes NA 15/37/F Quadrigeminal cistern Headache CTC No Yes NA 16/52/F Cerebral convexity Headache CTC No No NA 17/70/M Quadrigeminal cistern Incidental CTC No No NA 18/11/M L cerebellopontine angle Headache CTC No No NA 19/15/F Cerebral convexity Headache CTC No No NA 20/33/M Quadrigeminal cistern Headache CTC No No NA 21/82/M L middle fossa Incidental CTC No No NA 22/5/M Cerebral convexity Seizure CTC No No NA 23/38/M L middle fossa Headache CTC No No NA 24/33/M Cerebral convexity Disarticulation CTC No No NA 25/12/M Cerebral convexity Headache CTC No No NA 26/34/F R cerebellopontine angle Vertigo Surgery No NA No 27/22/F Retrocerebellar cistern Vertigo Surgery No NA No 28/1/M Retrocerebellar cistern Cardiomegaly Surgery No NA No 29/1/F Retrocerebellar cistern Developmental delay Surgery No NA No 30/21/F Quadrigeminal cistern Visual loss Surgery No NA No 31/10/M Retrocerebellar cistern Headache, nausea/vomiting Surgery No NA No 32/4/M Retrocerebellar cistern Ataxia Surgery No NA No 33/17/M L middle fossa Seizure CTC, surgery No No No 34/1/M L middle fossa Tendency to sleep CTC, surgery No No No 35/3/M R middle fossa Seizure CTC, surgery No No No 36/4/M L middle fossa Ataxia CTC, surgery No No No 37/40/F Quadrigeminal cistern Headache, Nausea/vomiting CTC, surgery No No No 38/11/M L middle fossa Temporal bulging CTC, surgery No No No 39/18/F Quadrigeminal cistern Headache CTC, surgery No No No * NA indicates not applicable.
