All of the following are premalignant except?

.Peutz-Jegher's syndrome has got increased risk of small bowel adenocarcinoma. * It is common in small intestine (jejunum) but can also occur in large intestine. * Features are multiple, familial, hamaomatous intestinal polyps. * Asssociated with melaenosis of the oral mucosa, lips (lower lip) and occasionally digits (not in tongue). * Microscopically it contains tree like branching filaments of mucosa with smooth muscle wall. * It can occasionally turn into malignancy. ref:SRB&;S manual of surgery,ed 3,pg no 831