your question is unclear and CSF leak and spinal stenosis are different clinical scenarios and more details are required to answer this question.
Ground glass is a radiological appearnce if described in Bone indicates a condition Fibrous Dysplasia (which is a bone disorder). However, in a Chest Ct if described for lungs it indicates alveolitis. (an early sign of interstitial lung disease) detailed opinion can be given only after knowing the full context of your query.
Black Blob!!! ~ i dont know but likely it means a gestational sac which looks like a sac like structure and is seen around 5 weeks. around 6 weeks you see the fetal pole and 6-7weeks u ll be able to appreciate the fetal cardiac activity.most likely there is nothing to worrry about.