Clinicopathological features of primary leiomyosarcoma of the gastrointestinal tract following recognition of gastrointestinal stromal tumours

Aims We aimed to elucidate the clinicopathological and immunohistochemical features of leiomyosarcoma ( LMS ) of the gastrointestinal ( GI ) tract. Methods and results We encountered seven cases of GI ‐ LMS in the colon ( n = 4), rectum ( n = 1), jejunum ( n = 1) and stomach ( n = 1). They ranged from 1 to 25 cm (median, 8.5 cm) in size and had high mitotic counts (median 38 per 50 high‐power fields). Morphologically, the tumours were composed...