A cavernous angioma is a tangle of tiny blood vessels that looks like a raspberry on an MRI. It can sit silently for years or leak without warning, so symptoms range from none to sudden emergencies. The most common problem is seizures. They may start as brief hand jerks, odd smells, or blank stares and can grow into full-body convulsions. Headaches come next. They feel dull and local, then spike if a small bleed irritates nearby brain tissue. Coughing or bending can make the throb worse. Weakness or numbness shows up when the lesion presses on motor nerves. One foot... Learn more