Before computers, accountants used special paper with columns to summarize general ledger entries. Columnar worksheets made accounting projects easier than if they were written on notebook paper.

Breast terminal duct epithelium which assumes a columnar morphologic appearance has been recognized for decades, and has been referred to by a variety of names, including abnormal involution, cystic ...

Columnar cell lesions of the breast are increasingly recognized at mammography for their tendency to calcify. We studied 392 vacuum-assisted core biopsies performed solely for calcifications to ...