You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Brown tumors are seen in: and explain in detail?
Brown tumors are highly vascular lytic lesions of the skeleton seen in both primary and secondary hyperparathyroidism. They result from the accumulation of abundant fibrovascular tissue and osteoclast like giant cells. Ref: Robbin's Basic Pathology, 7th Edition, Pages 1186, 1286; Ohopaedic Pathology By Vincent J. Vigorita, Bernard Ghelman, Douglas Mintz, 2007, Page 187.