Figure 1 : (a) : A 32-year-old male with concurrent sternal and pulmonary LCH. (a) Sagittal ultrasonogram of the sternum shows a heterogeneous low-echoic mass causing cortical disruption and soft-tissue extension. (b): Posteroanterior radiograph of the chest shows fine reticular opacities in the upper and middle zones of both lung fields. (c) : HRCT shows well-defined small nodules with occasional cavitationrevealing. (d) : Histologic features (hematoxylin and eosin, ×200) are histologic features characteristic of LCH.