This report provides a detailed analysis of the imaging techniques used in the diagnosis, treatment, and follow-up of Ductal Carcinoma In Situ (DCIS), using the case of Shailey, a 59-year-old female, as an example. The report begins with an introduction to DCIS, its causes, symptoms, and prevalence, highlighting Shailey's presentation of symptoms like redness, a lump, and pain in her left breast. It then examines the role of mammography in the initial diagnosis, discussing its advantages, limitations, safety considerations, and the appearance of DCIS on mammograms, including microcalcifications and opaque shadows. The report also covers the use of ultrasound-guided biopsy as a follow-up diagnostic tool, detailing its role in confirming the diagnosis, determining the grade of cancerous cells, and guiding treatment decisions. The report explores potential treatment interventions, such as lumpectomy followed by radiation therapy, and follow-up considerations, including the importance of mammograms to check for recurrence. Throughout the report, patient care, radiation safety, and adherence to protocols like the IR(ME)R are emphasized. The report also evaluates current working practices, additional imaging protocols, adaptation of techniques for different patient types, and potential patient diagnoses, providing a comprehensive overview of the DCIS pathway.