Final histological diagnosis of malignant cases classified as inadequate or indeterminate. Among inadequate cases, the most frequent histological subtype was SIDC (47/95, 49.5%), followed by Papi-tub (17/95, 17.9%), Solid-tub (15/95, 15.8%) and DCIS (6/95, 6.3%). SIDC was significantly more frequent than Papi-tub (**P < 0.0001), Solid-tub (***P = 0.0001) and DCIS (***P = 0.0001). Among indeterminate cases, the most common histological types were SIDC (27/73, 37.0%), Papi-tub (26/73, 35.6%), DCIS (7/73, 9.6%) and Solid-tub (7/73, 9.6%). There were no significant differences in the frequencies of these histological types. Papi-tub was significantly more frequent in indeterminate cases than in inadequate cases (36% vs 18%, P = 0.0151*). Dark gray, inadequate; light gray; indeterminate. SIDC, scirrhous growing type, invasive ductal carcinoma; Solid-tub, solid-tubular growing type, invasive ductal carcinoma; Papi-tub, papillotubular growing type, invasive ductal carcinoma; DCIS, ductal carcinoma in situ.
Yamaguchi et al. Diagnostic Pathology 2012 7:53 doi:10.1186/1746-1596-7-53