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.
What causes gigantism? Gigantism is almost always caused by a benign adenoma in the pituitary gland. An adenoma is a non-cancerous tumour and in the case of gigantism causes secretion of too much growth hormone. Pituitary tumours can be small in size (micro-adenoma) or large (macro-adenoma).