Table 2. Therapeutic outcomes and adverse events.

	Ultrathin endoscope ESD (20 lesions)
En bloc resection, n (%)	20 (100)
R0 resection, n (%)	17 (85.0)
Procedure time, min, mean ± SD	37.8 ± 28.2
Endoscopic approach, n (%)
Oral approach	13 (65)
Both oral and transnasal approach	7 (35)
Adverse event, n (%)
Perforation, n (%)	0 (0)
Laryngeal edema, n (%)	0 (0)
Postoperative bleeding, n (%)	0 (0)
Aspiration pneumonia, n (%)	0 (0)
Subcutaneous emphysema, n (%)	0 (0)
Duration of postoperative fasting, day, mean ± SD	1.7 ± 0.9
Duration of postoperative hospitalization, day, mean ± SD	5.8 ± 1.1

En bloc resection was defined as resection of the entire tumor in a single piece. R0 resection was defined as a complete resection with histologically negative lateral and vertical margins. Delayed bleeding was defined as overt bleeding occurring within 14 days of the ESD that necessitated an endoscopic hemostatic procedure using hemostatic forceps.

ESD, endoscopic submucosal dissection.