There are inflammatory breast disorders or of other origins that simulate neoplastic processes. They present a diagnostic dilemma requiring histological confirmation. We present two cases of Prosthetic Implants (PI) and bilateral palpable masses studied with Magnetic Resonance Imaging (MRI). The images showed enhanced solid masses suggesting neo-proliferative lesions; however, histopathological findings yielded no malignancy. Breast MRI is an important tool for detecting and characterizing various pathological processes, but there are cases in which the differential diagnosis becomes difficult. It is very important to recognize the main differential diagnoses of these entities since it may aid the clinical management, aiming at the use of more precise techniques for final diagnosis.

Palabras clave: Periprosthetic masses, breast cancer, MRI.

Perianal fistulas are a prevalent problem in current medical practice, with a high impact on morbidity. Treatment is not exempt from complications, such as local recurrence and fecal incontinence. Magnetic resonance imaging (MRI) plays an essential role in surgical planning in these patients, since the high spatial resolution of the latest equipment provides more precise information on the pelvis anatomy, indicating the number and relationship of the fistulous tracks with the anal sphincter. The aim of this work is to identify the different types of fistulas based on MRI features, with particular emphasis on the local anatomy and study techniques

Keywords: Anal canal; Fistula; Morbidity; Magnetic resonance imaging.