| PASI | Psoriasis Area Severity Index |
|---|---|
| PASI | Psoriasis Area and Severity Index |
| PV | psoriasis vulgaris |
| psoriasis rupioides | Psoriasis with concentric tiers of scales which give the appearance of the layering of an oyster shell. Synonym: psoriasis rupioides. (05 Mar 2000) |
|---|---|
| psoriasis spondylitica | Psoriasis associated with an ankylosing spondylitis. (05 Mar 2000) |
| psoriasis universalis | A generalised psoriasis. (05 Mar 2000) |
| pustular psoriasis | An extensive exacerbation of psoriasis, with pustule formation in the normal and psoriatic skin, fever, and granulocytosis; sometimes precipitated by oral steroids. Synonym: generalised pustular psoriasis of Zambusch. A local pustular eruption of the palms and soles, occurring most commonly in a patient with psoriasis; difficult to distinguish from acrodermatitis continua. (05 Mar 2000) |
| annular | <dermatology> Arranged in or forming a ring. (09 Oct 1997) |
| annular band | The strands of amniotic tissue adherent to the embryo or foetus; they may cause constriction of embryonic limbs. See: congenital amputation. Synonym: amniotic adhesions, annular band, constriction ring, Simonart's bands, Simonart's ligaments, Simonart's threads, Streeter's bands. (05 Mar 2000) |
| annular cartilage | <anatomy> The lower most of the laryngeal cartilages, may be palpated just below the thyroid prominence Adjacent the cricoid cartilage and the first tracheal ring is the cricothyroid membrane, a site used for rapid emergency airway access (cricothyroidotomy). (13 Nov 1997) |
| annular cataract | Congenital cataract in which a central white membrane replaces the nucleus. Synonym: disk-shaped cataract, life-belt cataract, umbilicated cataract. (05 Mar 2000) |
| annular illumination | <microscopy> The result of placing a stop in the first focal plane of the condenser to produce an illuminating cone of light with all the light flux near the surface of the cone. The central part of the cone will be dark. This arrangement is often used for a darkfield effect in low-power work by transmitted light. The condenser must be correctly focused and centreed. By reflected light, darkfield illumination is attained with an annular con-denser fitted around the objective for opaque objects. Annular illumination implies that the object is lighted from all sides. (05 Aug 1998) |
| annular ligament | <anatomy> One of a number of ligament's encircling various parts; the principal annular ligament's are those of the stapes, radius, and trachea. See: annular ligament of the radius, annular ligament of the stapes, annular ligaments of the trachea. Synonym: ligamentum annulare, orbicular ligament. (05 Mar 2000) |
| annular ligament of the radius | The ligament that encircles and holds the head of the radius in the radial notch of the ulna, forming the proximal radioulnar joint and enabling pronation/supination of forearm; receives the radial collateral ligament of the elbow. Synonym: ligamentum annulare radii, ligamentum orbiculare radii, orbicular ligament of radius. (05 Mar 2000) |
| annular ligament of the stapes | A ring of elastic fibres that attaches the base of the stapes to the margin of the fenestra vestibuli. Synonym: ligamentum annulare stapedis. (05 Mar 2000) |
| annular ligaments of the trachea | The fibrous membranes that connect adjacent tracheal cartilages. Synonym: ligamenta annularia trachealia, ligamenta trachealia. (05 Mar 2000) |
| annular lipid | The layer(s) of lipid bound to and/or surrounding an integral membrane protein. (05 Mar 2000) |
| annular pancreas | A rare condition where a ring of pancreatic tissue that forms around the duodenum causing partial or complete obstruction of the duodenum. A complete duodenal obstruction may be detected in the newborn although partial obstructions may not be detected well into adulthood. Nausea and vomiting are common symptoms. Diagnosis is via upper GI series, abdominal CT scanning or endoscopy. Treatment is surgical. Complications include peptic ulcer disease and perforation. (27 Sep 1997) |