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 True about GIST all except and explain in detail?
.GIST (Gastrointestinal stromal tumour) is rare but most common non epithelial small bowel tumours. * 25% of GIST occurs in small bowel (stomach - 50 to 60%). It is 0.2% of all GI tumours. * It is equal in both sexes * It arises from interstitial cell of Cajal. * More than 95% show c-kit (transmembrane receptor tyrosine kinase) mutation. * Many mesenchymal tumours of small bowel are now classified as GIST. GIST attains massive size when presenting clinically. * Palpable mass, compression, haemorrhage are the features. * CT is diagnostic. ref:SRB&;s manual of surgery,ed 3,pg no 812