| planum temporale | A slightly depressed area on the side of the cranium, below the inferior temporal line, formed by the temporal and parietal bones, the greater wing of the sphenoid, and a part of the frontal bone. Synonym: planum temporale. (05 Mar 2000) |
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| planum transpyloricum | A horizontal plane midway between the superior margins of the manubrium sterni and the symphysis pubis; the pylorus is not usually located on this plane in life. Synonym: planum transpyloricum. (05 Mar 2000) |
| haemangioma planum extensum | A benign, flat, cutaneous haemangioma of considerable size. (05 Mar 2000) |
| 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) |
| 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) |