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.
The symptoms of a spinal meningioma are caused by the pressure that the growing tumor exerts on the spinal cord or spinal nerves. Depending on the location of the tumor, meningiomas may cause weakness or numbness in the arms or legs, and/or difficulty with bladder, bowel and/or sexual function.