case_images: PMC4123268_01
case_images: Circular key ring marked and positioned on the scalp
case_images: SNI-5-109-g001.jpg
case_images: PMC4123268_01_SNI-5-109-g001.jpg
case_images: F1
case_images: It is marked on the scalp using a household key ring and fixed with either an adhesive tape or sutures [Figure 1].
case_images: Sagittal reconstruction showing ring in relation to the lesion
case_images: SNI-5-109-g002.jpg
case_images: PMC4123268_01_SNI-5-109-g002.jpg
case_images: F2
case_images: 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].
case_images: Coronal reconstruction showing ring in relation to the lesion
case_images: SNI-5-109-g003.jpg
case_images: PMC4123268_01_SNI-5-109-g003.jpg
case_images: F3
case_images: 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].
case_images: Post-op CT showing burr hole in relation to the lesion
case_images: SNI-5-109-g004.jpg
case_images: PMC4123268_01_SNI-5-109-g004.jpg
case_images: F4
case_images: 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].