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Click 12 year old male with right holohemispheric Developmental Venous anomaly (DVA). Select axial non-enhanced CT of the head. (Protocol: kV 120, mA 250, 2.5mm slice thickness). Multiple serpiginous hyperattenutating vascular structures within the right cerebral hemisphere and marginating the right occipital horn.

Click 12 year old male with right holohemispheric developmental venous anomaly (DVA). Select axial T1 MRI brain images. (Protocol: Pulse sequence; 2D Spin Echo, TR: 516.7, TE: 13, slice thickness: 5mm, Nex 1.0). Vascular flow voids within the right cerebral hemisphere and marginating the right lateral ventricle (white arrows). Note no caput medusae. Post traumatic left parietal scalp hematoma.

Click 12 year old male with right holohemispheric developmental venous anomaly (DVA). Select axial T1 post contrast MRI brain images. (Protocol: Pulse Sequence; 2 D Spin Echo, TR 846, TE 11.4, slice thickness 5mm, Nex 1.0, Multihance (Bracco Diagnostics, Princeton,NJ), 13ml injected through right forearm). Enhancement of the draining vein (large arrows) with poor visualization of radicular veins of the caput medusae. Post traumatic scalp hematoma.

Click 12 year old male with right holohemispheric developmental venous anomaly (DVA). Select axial MRI T2 brain images. (Protocol: Pulse sequence; 2D Spin Echo, TR: 4053.9, TE: 81.5, slice thickness: 5mm, Nex 1.0). Vascular flow voids within the right cerebral hemisphere and marginating the right lateral ventricle. Note no caput medusae. Post traumatic left parietal scalp hematoma.

Click 12 year old male with right holohemispheric developmental venous anomaly (DVA). Select axial FLAIR MRI brain images. (Protocol: Pulse sequence; 2D FLAIR, TR: 516.7, TE 13, slice thickness 5mm, Nex 1.0). Vascular flow voids within the right cerebral hemisphere and marginating the right lateral ventricle (white arrows). Note no caput medusae. Post traumatic left parietal scalp hematoma.

Click 12 year old male with right holohemispheric developmental venous anomaly (DVA). Select axial Time of Flight (TOF) MRA image of the brain. (Protocol: Pulse sequence; 3D Gradient Recall Echo, Maximum intensity projection TR: 25, TE: 3.4, Slice Thickness 1.4mm, Nex 1.0), No prominent right hemispheric arterial feeder vessel or vascular nidus.

Click 12 year old male with right holohemispheric developmental venous anomaly (DVA). Select axial TRICKS (Time resolved imaging of contrast kinetics, Optima 450, General Electric, Milwaukee, WI, USA) contrast enhanced MR angiography image of the brain. (Protocol: Pulse Sequence; 3D Gradient Recall Echo, TR: 3.6, TE: 1.4, Slice Thickness 2.4mm Nex: 0.5). Tortuous draining vein terminating in straight sinus. Cluster of vascularity not typical in appearance for a caput medusae.

Click 12 year old male with right holohemispheric developmental venous anomaly (DVA). Serial minimum projection intensity sequential axial susceptibility weighted angiography (SWAN) images of the brain. (Protocol: Pulse sequence; 3D Gradient Recall Echo, TR: 76.6, TE: 48.1, slice thickness 8mm Nex: 0.70). Distinct characterization of the diminutive veins comprising multiple venous radicals constituting the medusa head within all the right hemispheric lobes. Singular recipient vein coursing along the right lateral ventricle with entry to the straight sinus through the occipital horn.