20. Choice D is the correct answer. Craniopharyngiomas are mixed solid and cystic lesions that arise from the remnants of Rathke's pouch. These are benign lesions. Chordomas are locally aggressive tumors that metastasize from the pituitary gland. Primary Central Nervous System Lymphoma involves both pituitary and hypothalamus. These are malignant tumors. Germ Cell Pituitary Tumors are ectopic pinealomas that are malignant.
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