PMC4123268_01
Circular key ring marked and positioned on the scalp
SNI-5-109-g001.jpg
PMC4123268_01_SNI-5-109-g001.jpg
F1
It is marked on the scalp using a household key ring and fixed with either an adhesive tape or sutures [Figure 1].
Sagittal reconstruction showing ring in relation to the lesion
SNI-5-109-g002.jpg
PMC4123268_01_SNI-5-109-g002.jpg
F2
Helical CT is obtained (contrast if necessary), and reconstruction performed in two planes perpendicular to the ring and mutually perpendicular to each other [Figures 2 and 3].
Coronal reconstruction showing ring in relation to the lesion
SNI-5-109-g003.jpg
PMC4123268_01_SNI-5-109-g003.jpg
F3
Helical CT is obtained (contrast if necessary), and reconstruction performed in two planes perpendicular to the ring and mutually perpendicular to each other [Figures 2 and 3].
Post-op CT showing burr hole in relation to the lesion
SNI-5-109-g004.jpg
PMC4123268_01_SNI-5-109-g004.jpg
F4
Burr hole is made as per the entry point estimation and freehand biopsy is carried out perpendicular to the surface at the predetermined depth [Figure 4].