| xanthoma planum | A form marked by the occurrence of yellow flat bands or minimally palpable rectangular plates in the corium, either normolipaemic or associated with type IIa or III hyperlipoproteinaemia. (05 Mar 2000) |
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| os planum | A type of bone characterised by its thin, flattened shape, such as the scapula or certain of the cranial bones. Synonym: os planum. (05 Mar 2000) |