True smooth muscle neoplasms of the gastrointestinal tract: morphological spectrum and classification in a series of 85 cases from a single institute

True smooth-muscle neoplasms of the GI tract have been only rarely studied in the KIT era. Their incidence among other GI mesenchymal tumours and their clinicopathological spectrum have not been sufficiently analysed. We reviewed all GI mesenchymal lesions at the Pathology Institute of the Nuremberg Clinic Centre from 1994 through 2005. Among 262 lesions, there were 142 GISTs (54%) and 85 true smooth muscle neoplasms (32%). Smooth muscle...