Breast Imaging in the Time of COVID-19: A Singapore-based Breast Center's Experience in the Midst of a Pandemic.

The emergence of the COVID-19 pandemic presented new and yet uncharted challenges to the field of radiology, and consequently to breast imaging as a subspecialty. Maintaining a certain standard of care whilst ensuring the safety of patients and staff in our small Singapore-based breast imaging center are equally important and has resulted in modifications of our clinical practice and workflows. Screening patients for COVID-19 symptoms, risk factors, and potential exposure history has become paramount.

Evaluating the preoperative breast cancer characteristics affecting the accuracy of axillary ultrasound staging.

We evaluate the preoperative breast cancer (BC) characteristics that affect the diagnostic accuracy of axillary ultrasound (US) and determine the reliability of US in the different subgroups of BC patients. Axillary US assessments in women with invasive BC diagnosed between 2009 and 2016 in a single institution were retrospectively reviewed. The diagnostic accuracy of axillary US was obtained using surgical nodal histology as the gold standard.

Preoperative predictors of high and low axillary nodal burden in Z0011 eligible breast cancer patients with a positive lymph node needle biopsy result.

Background: Z0011 trial showed that early breast cancer patients with low axillary nodal burden, may be spared an axillary lymph node dissection with no survival compromise. Axillary lymph node dissection can be reserved for patients with a high axillary nodal burden. We aim to determine the preoperative factors that could distinguish between low and high axillary nodal burden in Z0011 eligible patients with a needle biopsy proven metastatic node.

Mammographic and sonographic features of fat necrosis of the breast.

Imaging features of fat necrosis vary depending on its stage of evolution and can mimic malignancy in late stages. Imaging may suffice to differentiate fat necrosis in the early stages from malignancy and thus avoid unnecessary biopsy. In this pictorial essay, we present combination of benign features in mammography and/or ultrasonography (USG) that can lead to imaging diagnosis of fat necrosis.

Sacrococcygeal myxopapillary ependymoma with anaplastic ependymoma component in an infant.

Sacrococcygeal location of myxopapillary ependymoma (MPE) is uncommon. Local recurrence and metastases are on record inspite of its benign characteristics. We report a rare case of sacrococcygeal MPE in an 11-month-old female child who showed typical myxopapillary ependymal histology along with anaplastic ependymal component.