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Text based Mining is the process of analyzing a document or set of documents to understand the content and meaning of the information they contain. Text Mining enhances human's ability to Process massive quantities of information and it has high Commercial values. Text mining, sometimes alternately referred to as text data mining, roughly, process of deriving highquality information from text. High-quality information is typically derived through the devising of patterns and trends through means such as statistical pattern learning. It usually involves the process of structuring the input text deriving patterns within the structured data, and finally evaluation and interpretation of the output. 'High quality' in text mining usually refers to some combination of relevance, novelty, and interestingness. Typical text mining tasks include text categorization, text clustering, concept/entity extraction, analysis and entity relation modeling (i.e., learning relations between named entities).

REFERENCES1 Graber MA, Randles BD, Ely JW, et al. Answering clinical questions in the emergency department. Am J Emerg Med (in press). 2 Ely JW, Osheroff JA, Gorman PN, et al. A taxonomy of generic clinical questions: classification study. BMJ 2000;321:429-32. 3 Reichert S, Simon T, Halm EA. Physicians' attitudes about prescribing and knowledge of the costs of common medications. Arch Intern Med 2000;160:2799-803. 4 Glickman L, Bruce EA, Caro FG, et al. Physicians' knowledge of drug costs for the elderly. J Am Geriatr Soc 1994;42:992-6. 5 Shrank WH, Asch SM, Joseph GJ, et al. Physicians' perceived knowledge of and responsibility for managing patients' out-of-pocket costs for prescription drugs.A 28-year-old man presented to eye casualty with left orbital headache. The physical examination was normal but fundoscopy showed left sided papilloedema. There were no features indicative of infection/sepsis, and no history of primary malignancy. Blood results were not suggestive of infective pathology. Computed tomographic (CT) brain scan showed multiple ring enhancing lesions, suggestive of multiple cerebral metastases and/or brain abscess (figs 1 and 2). Brain biopsy on immunohistochemistry staining using Melan-A and HMB45 showed melanin pigment within disorderly arranged cells, confirming the diagnosis of malignant melanoma (fig 3).Malignant melanoma was diagnosed when our patient presented with cerebral metastases. In 70-80% cases of melanoma recurrence, metastases are seen in the brain. Cerebral metastases in melanoma have prognostic value. 1 The central nervous system is a common site for metastases from many malignancies including melanoma. Multiple ring enhancing lesions are suggestive of metastases or abscess. Brain biopsy is usually not necessary in all cases as diagnosis of cerebral metastases is usually apparent from the history. Ring enhancing lesions should be differentiated by appropriate investigation.