Preoperative evaluation of submucosal invasive colorectal cancer using a 15-MHz ultrasound miniprobe.
OBJECTIVE
Recently, it was reported that focal submucosal invasive colorectal cancer could be treated by polypectomy or endoscopic mucosal resection (EMR) because of the rarity of lymph-node metastasis. Our objective was to examine the accuracy and efficacy of a 15-MHz ultrasound miniprobe in the preoperative evaluation of the degree of submucosal invasion in colorectal cancer.


METHODS
A total of 35 patients with submucosal invasive colorectal cancer who underwent ultrasonography with a miniprobe were studied prospectively. The results of this imaging were compared with the histologic findings in resected specimens.


RESULTS
Although the accuracy of the miniprobe in categorizing submucosal invasion into three subclasses (SM1, invasion limited to the upper third; SM2, limited to the middle third; SM3, limited to the lower third) was low (37.1%; 13/35), the accuracy in differentiation between < or = SMI (M and SMI) and > or = SM2 (SM2, SM3, MP, and S) was 85.7 % (30/35).


CONCLUSIONS
The miniprobe can be useful for therapeutic decision-making in submucosal invasive colorectal cancer.
Harada
N
N
Dept. of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan. zico@intmed3.med.kyushu-u.ac.jp
Hamada
S
S
Kubo
H
H
Oda
S
S
Chijiiwa
Y
Y
Kabemura
T
T
Maruoka
A
A
Akahoshi
K
K
Yao
T
T
Nawata
H
H
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015179:Colorectal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D019160:Endosonography / Q000295:instrumentation*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness