Transrectal ultrasound and magnetic resonance imaging measurement of extramural tumor spread in rectal cancer

Table 1 Transrectal ultrasound and magnetic resonance imaging were requested in 153 patients with rectal tumors detected by endoscopy

Patients with suspected rectal cancer admitted to local staging using TRUS and MRI	n
Excluded:
No MRI: pacemaker: 3; claustrophobia: 1	4
No TRUS: poor cleansing: 4; pain: 2; refused: 2	8
Other cancers excluded: anal cancer: 7; carcinoid: 2; GIST: 1; prostate cancer: 1	11
Adenocarcinomas excluded: duplex tumour: 1; stent: 1; sigmoid tumour: 5	7
< uT3: uT1: 9; uT2: 18	27
uT3 with insufficient documentation of outgrowth measurement	4
uT4 with insufficient documentation of outgrowth measurement	6
Total study group	86

Of these, 67 were patients excluded from the study. TRUS: Transrectal ultrasound; MRI: Magnetic resonance imaging; GIST: Gastrointestinal stromal tumor.

Table 2 Extramural invasion measured by transrectal ultrasound and magnetic resonance imaging

	MRI-a	MRI-b	MRI-c	MRI-d
TRUS-a	10	6
TRUS-b	1	31	3
TRUS-c			25	3
TRUS-d			2	5

TRUS: Transrectal ultrasound; MRI: Magnetic resonance imaging. The sub-classification of ≥ T3 was defined as: a: 0 to 1 mm; b: 1-5 mm; c: 6-15 mm; d: > 15 mm.