All parts of the jimsonweed plant are poisonous to horses and humans; toxicity is caused by tropane alkaloids. Symptoms of poisoning in horses include a weak, rapid pulse, dilated pupils, dry mouth, incoordination, diarrhea, convulsions, coma, and sometimes death.
Meningioma Causes. The causes of meningioma are not yet fully understood. In fact, several research studies suggest that many meningiomas develop spontaneously, or without a known cause. Sometimes, these tumors can disappear spontaneously as well. Meningiomas, like other solid tumors, develop when healthy cells undergo genetic mutations that cause them to replicate uncontrollably.
Meningioma is a type of slow-growing tumor that forms in the thin layers of tissue that cover and protect the brain and spinal cord. Learn about brain tumors and find information on how we support and care for people with meningioma before, during, and after treatment.he prognosis and treatment options for metastatic brain and spinal cord tumors depend on the following: 1  Whether there are more than two tumors in the brain or spinal cord. 2  Where the tumor is in the brain or spinal cord.