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.
Treatments. Surgery, particularly for medium to large meningioma brain tumors, is more successful than for most other brain tumor types and is the preferred treatment for accessible meningiomas. However, very large meningioma tumors may get into brain tissues or surrounding veins, making surgical removal difficult.reatments. Surgery, particularly for medium to large meningioma brain tumors, is more successful than for most other brain tumor types and is the preferred treatment for accessible meningiomas. However, very large meningioma tumors may get into brain tissues or surrounding veins, making surgical removal difficult.