Table 2.

Literature review table of breast imaging characteristics of primary neuroendocrine carcinoma of the breast.

Source	Ultrasound	Mammogram	MRI
Park Y et al., 2014 [12]	Irregular Hypoechoic Indistinct margins No or enhanced posterior acoustic features	High density Round or oval or lobular mass with nonspiculated margins	Irregular mass Irregular margins Washout kinetics
Chang E et al, 2013 [11]	Irregularly shaped Heterogeneous Lobulated margins Posterior enhancement Increased vascularity	High-density mass with ill-defined margin	Heterogeneously low T1 high T2 Washout kinetics
Valentim M et al, 2014 [13]	Irregular and ill defined, solid Hypoechoic	Ovoid well-defined mass	Irregular Peripheral ring enhancement Washout kinetics
Stita W et al. 2009 [14]	Ill-defined mass Hypoechoic Microlobulated	Ovoid high-density mass w/ ill-defined margins	N/A
Angarita F et al. 2013 [15]	N/A	Distinctive mass w/ microscopic calcifications and spiculations	N/A
Jeon C et al 2014 [16]	Solid irregular, ill defined Hypoechoic Posterior enhancement Increased vascularity Cystic components	Mass, circumscribed, isodense	Isointense on T2 Irregular, indistinct margins Washout kinetics
Gunhan-Bilgen et al 2003 [7]	Irregular Hypoechoic Microlobulated	Dense, round, speculated, or lobulated margins	N/A
Kim J et al 2008 [17]	Oval Heterogeneous Microlobulated	Well-demarcated lobulated mass	N/A

MRI, magnetic resonance imaging.