This is a multicenter observational study aimed to investigate the management of older patients aged 75 years old and over admitted to the emergency department with complicated colorectal cancer.

The final endpoint is to report morbidity and mortality in this group of frail individuals according to the shift of incidence of colorectal cancer in geriatric patients, over 2 periods: before the COVID pandemic outbreak (11th March 2020) and after the 11th March, during the ongoing pandemic.

Inclusion Criteria:

• Patients aged 75 years old and over;
• Admission to the emergency department with acute abdominal pain;
• Diagnosis of obstructed and/or perforated colorectal cancer.

Exclusion Criteria:

• Patients aged< 75 years old;
• Patients aged >=75 years old admitted with acute abdomen, not due to complicated colorectal cancer.

All older (aged 75 years old and over) patients who were admitted to the surgical department with acute abdominal pain due to a complication of colorectal cancer.