PMC2852748_01
Nine-year-old girl with foreign body granuloma of the left foot. A and B: Coronal plain and enhanced computed tomography (CT) of the left foot. Plain CT showed a mass (solid arrow) with iso to low-density area. Peripheral area of the lesion was enhanced, but the center of the lesion was not (open arrow). C and D: Sagittal T1- and T2-weighted images of the left foot. The mass had iso intensities on T1- and high intensities on T2-weighted images to the muscles. Foreign bodies were not identified. E: After gadolinium injection, the peripheral area (arrow) of the lesion was strongly enhanced. F: Two wooden splinters (5x4 mm) were removed at surgery. G: Histological evaluation of the wall of the mass. Inflammatory cell proliferation with giant cell formation (arrow) was observed.
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CT showed an iso to low-density mass at the plantar aspect of her foot (Figure 1A). The peripheral area of the lesion was enhanced, but the center was not (Figure 1B). T1-weighted images (Figure 1C) and high signal intensities on T2-weighted images (Figure 1D) to the muscles. The peripheral area of the lesion was strongly enhanced after gadolinium injection (Figure 1E). Surgery revealed two wooden foreign bodies (5x4 mm) surrounded by granulation tissue (Figure 1F). Histological examination showed inflammatory cell proliferation with giant cell formation, which was coincident with the findings of foreign body granuloma (Figure 1G).
PMC2852748_02
Fifty-five-year-old woman with foreign body granuloma of the left posterior thigh. A: Axial computed tomography (CT) of the left thigh. Huge mass in the hamstring muscle (solid arrow) with a small high-density fragment (open arrow) was observed. B and C: Sagittal T1- and T2-weighted images of the left posterior thigh. The mass had low intensities on T1- and high intensities on T2-weighted images to the muscles. The small fragment inside the mass showed low intensities to the muscles (arrow). D: The peripheral area of the lesion (arrow) was strongly enhanced after gadolinium injection. E: Cut surface of the lesion. The mass was filled with much fluid and granulation tissue. A foreign body (arrow) was seen inside the mass. F: A fragment of tile (3x1 cm) was removed at surgery.
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CT showed a huge mass in the hamstring muscles (Figure 2A). T1- and high intensities on T2-weighted images to the muscles (Figure 2B, C). The small fragment inside the mass showed low intensities to the muscles on both T1- and T2-weighted images. After gadolinium injection, the wall of the mass was strongly enhanced (Figure 2D). A fragment of tile (3x1 cm) was found inside a cystic tumor lined with granulation tissue (Figure 2E, F).
PMC2852748_03
Three-year-old girl with foreign body granuloma of the right posterior lower leg. A and B: Sagittal T1- and T2-weighted images of the right posterior lower leg. The mass had low intensities on T1- and high intensities on T2-weighted images (arrows). Central area of the lesion had low intensities both on T1- and T2-weighted images. C and D: Sonography imaging perpendicular and horizontal to the foreign body. The foreign body was observed as a hyperechoic lesion (arrow) with posterior acoustic shadowing (solid arrowheads) and hypoechoic halo (open arrowhead). E: A 3-cm long tip of toothpick was removed at surgery.
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T1- and high intensities on T2-weighted images. The small lesion inside the mass showed low intensities on both T1- and T2-weighted images (Figure 3A, B). Ultrasound sonography visualized a foreign body as a hyperechoic focus with posterior acoustic shadowing and a hypoechoic halo (Figure 3C, D). At surgery, a 3-cm-long toothpick tip was removed (Figure 3E).