An 11-year-old presents with 6-month history of groin pain. X-rays and biopsy specimen are shown in Figure A and B. What is the etiology of the lesion?

Figure 38 is the radiograph of a 12-year-old boy who has left foot pain. Examination of the foot will reveal

The radiographs are of a 1-year-old girl who underwent bilateral reconstructive surgery for a similar bilateral hand deformity. During embryogenesis, there was a problem with control of the anteroposterior (AP) axis (thumb to small finger, great toe to small toe) in all of her developing limb buds. The AP axis, which is under the control of an area of tissue in the posterior aspect of the apical ectodermal ridge, is known as the

The radiographs are the radiographs of a 6-year-old girl who fell on her outstretched right hand. What is the best next step?