Starting as “infiltrating carcinoma”, this was preferentially called “invasive ductal carcinoma (IDC)” only from the 2nd edition (basically remaining as such in the 3rd edition, too), with a number of synonyms like carcinoma of no special type (the currently preferred term occurring as early as 1981), infiltrating duct carcinoma not Invasion may also be associated with mucinous differentiation or present as carcinoma of no special type (NST) . Invasive lobular carcinoma (ILC) mimicking SPC has been described in the differential diagnosis to SPC and also EPC but the small number of reported cases allows only limited conclusions [ 72 ]. Frequently, the carcinomatous components are invasive ductal carcinoma of no special type with a cribriform growth pattern, but other histological types such as lobular, squamous, papillary, mucinous, and metaplastic carcinoma have also been reported [19,20,21,22]. Grossly, the tumors display red-brown to dark-brown color, which is due to the With a prevalence of 50–80%, invasive ductal carcinoma (invasive carcinoma of no special type, NST) is the most common breast cancer type. 20 In our study, NST was histopathologically confirmed in 61% of the patients. Two NST were associated with in situ carcinoma; however, no sole ductal carcinoma in situ (DCIS) was found. Invasive breast cancer includes various histologic subtypes and they have a variety of unique morphological characteristics and MR enhancement patterns. Invasive carcinoma of no special type (NST) accounts for majority of breast cancers and has different clinical courses and prognoses according to pathologic immunohistochemical (IHC) markers. With regard to histologic classification, the majority (>75%) of invasive breast cancers are of no special type (NST) frequently referred to as invasive ductal carcinoma (IDC). Even in core biopsy samples, it is important to recognize whether the tumor may represent the invasive mucinous micropapillary carcinoma variant (Fig. 13.3).Like its conventional counterpart, >90% of the mucinous micropapillary carcinoma is mucinous, but tumor cells suspended in mucin pools additionally show a predominantly micropapillary configuration with pseudoacinar formation. Invasive breast carcinoma of no special type and variants Sebaceous. Author: Monika Roychowdhury, M.D. Last author update: 1 August 2012. Last staff update: 17 March .

invasive carcinoma of no special type