Infant with a warm, red, swollen elbow

Radiograph of osteomyelitis beyond neonatal to 18 months — AP (left) and lateral radiographs (right) of the elbow show extensive periosteal reaction of the distal humerus and proximal ulna and an effusion of the elbow joint.

The diagnosis was beyond neonatal to 18 months osteomyelitis due to Gonococcus.

Infant with decreased motion of the right arm

Radiograph of neonatal osteomyelitis — AP radiograph of the right humerus at presentation (left) is unremarkable. AP radiograph of the right humerus 1 month later (right) shows destruction and medial displacement of the epiphysis of the humerus and extensive periosteal reaction along the metaphysis and diaphysis of the humerus.

The diagnosis was neonatal osteomyelitis due to Staphylococcus that crossed the growth plate.

School ager with a rash and weakness

MRI of dermatomyositis — Axial T2 (upper left) and coronal STIR (upper right) MRI without contrast of the pelvis show increased signal intensity in all of the muscles in the pelvis and thighs while the coronal T1 without contrast (lower left) and coronal T1 with contrast (lower right) MRI of the pelvis show enhancement in all of the muscles in the pelvis and thighs.

The diagnosis was dermatomyositis.