46 years Female with history of stepping on glass under fourth metatarsal head with right plantar forefoot pain/callus formation, evaluate for foreign body. Along the plantar aspect of the forefoot inferior to the fourth metatarsal head and immediately subjacent to the skin, there is a 0.8 x 0.3 x 0.8 cm well-defined oval-shaped isoechoic structure which seems to correspond to the area of signal abnormality described on recent MRI. This structure is nonspecific but could represent a retained foreign object.
An 8 mm isoechoic structure just deep to the skin along the plantar aspect of the fourth metatarsal head which is non-specific but could represent a retained foreign object versus sequela of prior soft tissue injury.