Objective To investigate the imaging features of invasive micropapillary carcinoma(IMPC)of the breast in magnetic resonance imaging(MRI)and mammography(MG).Methods The clinical data of 25 patients with IMPC confirmed by biopsy or surgical pathology were retrospectively collected from Cancer Hospital of Shantou University Medical College from January 2017 to April 2023.All patients underwent MRI examination,20 of which underwent MG examination.Imaging features,histopathological features and receptor status of patients were recorded and analyzed.Results In 25 patients,20 patients had palpable mass.A total of 33 lesions were detected by MRI.One patient had a non-mass lesion and 24 had a lump-like lesion.The lump was mainly irregular in shape,with irregular or burr edges,and the apparent diffusion coefficient was(0.862×10-3±0.135×10-3)mm2/s.The time-signal intensity curve of the lump was mainly flat or outflow type.MG showed no abnormality in one patient,22 lesions were detected in 19 patients,and the lump were mostly irregular in shape,with unclear edges or burrs,and 10 patients showed the lump accompanied by microcalcification.Lymph node abnormalities were detected in 11 cases by MRI and 6 cases by MG,respectively,and axillary lymph node metastasis was found in 14 cases by final pathology.Immunohistochemical results showed that 24 cases were positive for estrogen receptor,22 cases were positive for progesterone receptor and 7 cases were positive for human epidermal growth factor receptor 2.Conclusion The imaging findings of IMPC mostly showed irregular shape,unclear boundary,multiple burrs at the edge,uneven enhancement,soft tissue mass with microcalcification,and high axillary lymph node metastasis rate,which could provide important references for the clinical treatment and prognosis evaluation of IMPC.