Figure 5:

Example false-negative and false-positive findings. False-negative metastases (top row) were typically smaller than 3 mm or had other challenging characteristics, such as a subtle enhancement pattern or close proximity to the dura or prominent vessels. False-positive findings included calvarial metastases, as well as benign lesions, such as schwannomas or vascular lesions, including capillary telangiectasias and developmental venous anomalies.