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Table 1 Reported cases of colorectal cancer resembling SMT in which tumor was completely covered with normal colorectal mucosa

From: Resection of rectal cancer resembling submucosal tumor that was preoperatively diagnosed with endoscopic ultrasound-guided biopsy

Case

Year

Age (years)

Gender

Locationa

Size (cm)

Endoscopic findings

Depth of invasionb

Histologic diagnosis of biopsy specimen

Histologic diagnosis of resected specimenc

Lymph node metastasis

Distant metastasis

Reference

1

2005

57

M

Rb

10

None

A

Unknown

Muc

Absent

Unknown

5

2

2011

82

M

S

8

None

SS

Normal mucosa

Muc

Absent

Absent

6

3

2014

79

M

Ra

2.6

Erosion

SE

Not performed

Mod

Absent

Absent

7

4

2017

55

F

RS

4

None

SS

Normal mucosa

Mod

Present

Liver metastasis

Our case

  1. aLocation. Ra upper rectum, Rb lower rectum, RS rectosigmoid, S sigmoid colon
  2. bDepth of invasion. A adventitia, SE serosa, SS subserosa
  3. cHistologic diagnosis of resected specimen. Mod moderately differentiated adenocarcinoma, Muc mucinous carcinoma