[Stomach leiomyosarcoma. Clinico-diagnostic considerations and therapeutic criteria].

An observed case of leiomyosarcoma of the stomach in a 67 year old man leads to an analysis of the diagnostic, clinical and therapeutical aspects of this myoid tumour in the digestive tract representing 50-60% of cases. Symptoms are aspecific and gastric bleeding is the most common sign (50%). leiomyosarcoma always presents considerable problems of diagnosis and represents the most important among the various examined diagnostic investigations but it is maintained that surgery many times plays a primary role in the diagnosis of this tumour. The accuracy of gastrofiberoscopic biopsy is limited by frequent false-negative cases. False negative cases are obtained because the tumour tissues are usually covered by gastric mucosa and so the biopsy with standard forceps is too small and too superficial. The ultrasonographic finding of a gastric leiomyosarcoma is variegated, in fact it can be hyperechoic or hypoechoic. Frequently we can see echo-free spaces due to liquefactive necrosis and in such a case, an echogenic rim is demonstrable. According to our experience ultrasonography is very important in post-operative follow-up. The TC study can be considered superior to the other diagnostic investigations, in fact with it, detailed characteristics and location of the tumour, invasivity, metastatic dissemination, are recognized. It is still controversial the criterium concerning the diagnosis of malignant smooth muscle tumour of the gastrointestinal tract. We believe that number of mitoses (having five or more mitotic figures x 10 high-power fields), cellularity, pleomorphism, atypicality, together with macroscopic aspects (size, bleeding, ulcerations, necrosis, invasivity) are the most reliable indicators of malignancy.(ABSTRACT TRUNCATED AT 250 WORDS)