A 58-year-old man was referred for resection of a pedunculated polyp, which had a
head measuring 3.5 × 2.8 cm and a stalk 1.5 cm in diameter, over the sigmoid colon.
We initially applied a detachable loop over the stalk, but no total cyanotic change
of the polyp head was observed. We applied a second loop, but it became entrapped
in the head of the polyp without tightening ([Fig. 1]). We attempted to cut the redundant loop using single-scissor forceps (FS-3L-1;
Olympus, Tokyo, Japan) ([Fig. 2]), but failed because the nylon loop easily slipped away from the flat blades. Therefore,
we used a double-channel gastroscope (GIF-2TQ260M; Olympus) and combined biopsy forceps
to grasp the loop and scissor forceps to cut the loop and remove it successfully ([Fig. 3] and [Video 1]). After ensuring effective ligation of the stalk using an additional third loop,
we finally resected the polyp by cutting the stalk with a DualKnife (KD-650 U; Olympus)
and smoothly dragged the polyp out ( [Fig.4]). Histological examination confirmed the polyp to be a tubulovillous adenoma with
focal adenocarcinoma confined to the mucosal layer.
Fig. 1 Pedunculated polyp that underwent an incomplete cyanotic change, with an entrapped
loop.
Fig. 2 Scissor forceps with flat blades.
Fig. 3 Combining biopsy forceps to grasp the loop with scissor forceps to cut the loop.
Fig. 4 The 3.5 × 2.8 cm pedunculated polyp which was successfully removed.
A detachable loop might occasionally stick to the ligating device, and recommendations
are available for that situation [1]. In addition, events that are more common involve the ineffective loop being entrapped
in the polyp and being difficult to remove with forceps only, especially when there
is a large pedunculated polyp in a limited space. Using scissor forceps is another
choice – either using two flat blades for cutting tissue or foreign objects within
the digestive tract, or using a depressed portion of one of the blades, a so-called
loop cutter. The grasping and cutting method using a double-channel scope facilitates
cutting the loop using flat-blade scissor forceps. Based on our research, no such
combinatory technique has been reported in relevant literature.
Endoscopy_UCTN_Code_TTT_1AQ_2AD
Using biopsy forceps and scissor forceps to cut the loop trapped in a pedunculated
polyp.
