MSD Manual

Please confirm that you are a health care professional

Yes No

Leave this Site?

The link you have selected will take you to a third-party website. We do not control or have responsibility for the content of any third-party site.

Continue Cancel
MSD Manual
Professional Version
The trusted provider of medical information since 1899
Medical Topics & Chapters
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Professional /
Gastrointestinal Disorders /
... /
Tumors of the Gastrointestinal Tract /

Tumors of the Gastrointestinal Tract

Expand all Collapse all

MSD and the MSD Manuals

Merck & Co., Inc., Kenilworth, NJ, USA (known as MSD outside of the US and Canada) is a global healthcare leader working to help the world be well. From developing new therapies that treat and prevent disease to helping people in need, we are committed to improving health and well-being around the world.  The Manual was first published as the Merck Manual in 1899 as a service to the community. The legacy of this great resource continues as the MSD Manual outside of North America. Learn more about our commitment to Global Medical Knowledge.

View Privacy Shield Verification Status
View APEC CBPR Privacy Certification Status

This website is certified by Health On the Net Foundation. Click to verify. This site complies with the HONcode standard for trustworthy health information:
verify here.

© 2021 Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc., Kenilworth, NJ, USA