Hereditary non-polyposis colorectal cancer

Hereditary non-polyposis colorectal cancer (HNPCC), also known as Lynch syndrome, is an inherited condition which predisposes to a host of malignancies, including colorectal carcinoma. It is considered the most frequent form of hereditary colorectal cancer. Diagnosis requires evaluation using clinical criteria (see: Amsterdam criteria for HNPCC).

Typically HNPCC patients present in their forties and fifties with colorectal cancer 2, or with one of the associated malignancies. 

HNPCC is due to mutations in DNA mismatch repair (MMR) genes 2, resulting most frequently in colorectal carcinoma (80% lifetime risk) as well as extracolonic malignancies, including 1-2:


Radiographic features are related to the underlying conditions:

The high risk of colorectal carcinoma warrants screening of the colon from 25-40 years of age 2, and may require colectomy. With close surveillance and resection of any adenomas which develop the risk of CRC can be reduced by 60% 3.

Due to a high number of extracolonic tumours, various screening programs should also be instituted, such as transvaginal ultrasound screening of the uterus and ovaries and serum CA-125 2.

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Article information

rID: 1614
Sections: Pathology, Syndromes
Synonyms or Alternate Spellings:
  • Hereditary non polyposis colorectal cancer (HNPCC)
  • Hereditary non polyposis colorectal cancer
  • Lynch syndrome
  • Hereditary non-polyposis colorectal carcinoma
  • Lynch II syndrome

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