Malignant neoplasm of prostate [C61] / Secondary malignant neoplasm of bone [C79.51], Reason for Study: There is interval increase in thickness of the left frontal extra axial lesion just underneath of the left frontal sclerotic skull lesion. The lesion shows some mass effects toward underlying brain parenchyme. The lesion is measured about 43.8mm (AP) x 7.3mm (RL) x 7mm (CC). Considering the patient's clinical history and overlying sclerotic skull lesion, this lesion is likely represent metastatic dural and extradural lesion.There is no other abnormal enhancement.There is no evidence of acute ischemic or hemorrhagic lesion on this scan.Known left frontal sclerotic skull lesion remains stable in terms of size and MR signal characteristics.The ventricles, sulci and cisterns are symmetric and unremarkable. The midline structures and cranial-cervical junction are normal. Ectatic changes of intracranial arterial system especially vertebrobasilar system indicating atherosclerotic changes such as dolichoectasia. No significant interval change since prior scan. If indicated brain MRA can be considered for further evaluation of intracranial arterial system.The paranasal sinuses and mastoid air cells are clear.
1. Interval increase in size of left frontal extradural enhancing lesion underneath the known left frontal sclerotic metastatic lesion. 2. Stable left frontal sclerotic skull lesion since prior scan.3. Atherosclerotic changes of intracranial arterial system especially dolichoectatic change of vertebrobasilar system, unchanged since prior scan.