Teenager with a malignant bone tumor who has headaches and vomiting Pediatric Imaging Neurological December 6, 2025September 23, 2025 Axial CT without contrast of the brain shows a large dense lesion in the posterior aspect of the right cerebral hemisphere which has high density calcification along its most posterior aspect. The lesion is surrounded by low density vasogenic edema. The diagnosis was brain metastasis in a patient with osteosarcoma. Related Published December 6, 2025September 23, 2025