Rugger-jersey spine describes the prominent subendplate densities at multiple contiguous levels to produce an alternating dense-lucent-dense appearance. This simulates the transverse bands of a rugby jersey. This term and pattern is distinctive for hyperparathyroidism. http://radiopaedia.org/articles/rugger-jersey-spine
Pisiform fractures are an uncommon type of fracture involving the carpal bones. Epidemiology They are only thought to account of all carpal fractures. Approximately occur in association with other carpal fractures.
The cockade sign is a classic appearance of an intraosseous lipoma of the calcaneus which presents as a well-defined lytic lesion with a central calcification resembling a cockade. It is named after a cockade, which is a badge, usually in the form of a rosette or knot, generally worn on the hat. https://radiopaedia.org/articles/cockade-sign-intraosseous-lipoma
Mandibular lesions are myriad and common. The presence of teeth results in lesions that are specific to the mandible (and maxilla) and a useful classification that defines them as odontogenic or non-odontogenic.
Metaphyseal erosion and widening with a sclerotic border at the distal radial growth plate is compatible with gymnast wrist. This is a chronic stress injury due to axial overload of the physis, most often seen in elite gymnasts.