Fig. 4From: Ultrasonographic prevalence and characteristics of non-palpable thyroid incidentalomas in a hospital-based population in a sub-Saharan countryTIRADS 4 incidentalomas. TIRADS 4A: a moderately hypoechoic solid nodule of sharp margins (a) with peripheral vascularization (b). TIRADS 4B: hypoechoic nodule with microcalcifications (c) and marked hypoechoic nodule with mixed vascularization (d)Back to article page