<unk>  appear after an episode of poisoning with arsenic, thallium or other heavy metals or selenium, opioid MT-45, and can also appear if the subject is suffering from kidney failure. They have been observed in chemotherapy patients.
Mees' lines
Kerley lines
Cramp-ring
Contour threads
Curschmann's spirals
Green ribbon
Tycoon's cap
Dennie–Morgan fold