Bones to Ashes

Under the microscope, the outer bone surface is a moonscape of craters...

''Preliminary diagnosis?''
''Deformity of the bone. Maybe. Cortical destruction on a metacarpal. Maybe. Localised infection? Systemic disease process? Postmortem destruction, either purposeful or natural? A combination of the above? I don''t have a diagnosis...''

The skeleton is that of a young girl, no more than fourteen year...