Objective To investigate the CT and MRI imaging characteristics of colorectal schwannoma.Methods The clinical data and imaging data of 4 patients with colorectal schwannoma confirmed by histopathology were retrospectively collected,and the CT and MRI imaging features were analyzed in combination with the literature.Results All 4 cases of colorectal schwannoma occurred in females,with an average age of 61 years old.The lesions of 2 cases were located in the ascending colon ileocecal region,and the lesions of 2 cases were located in the lower rectum.All 4 cases had changes in stool habits and traits.All of the 4 lesions were round-like masses on CT,which were connected with the intestinal wall with a wide base and caused eccentric stenosis of the intestinal cavity.The plain scan density was uneven,and small patchy low-density areas could be found.The CT enhanced scanning showed all of 4 cases were unevenly enhanced,of which 2 cases had lymph node enlargement and 1 case had metastasis.MRI of 1 case showed isointense signal on T1-weighted imaging(T1WI)and heterogeneous high density on T2-weighted imaging(T2WI),and moderate heterogeneous enhancement after enhancement.Colonoscopy showed that 3 cases had smooth surface and complete capsule,and 1 case had multiple ulcers on the surface and was malignant.Conclusion Colorectal schwannoma is more common in middle-aged and elderly women,and its CT and MRI imaging manifestations have certain characteristics.
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