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purpura

purpura (pur´pu-ra)

A condition characterized by hemorrhage into the skin. Appearance of the lesions varies with the type of p., the duration of the lesions, and the acuteness of the onset. The color is first red, gradually darkens to purple, fades to a brownish yellow, and usually disappears in 2 or 3 weeks; color of residual permanent pigmentation depends largely on the type of unabsorbed pigment of the extravasated blood; extravasations may occur also into the mucous membranes and internal organs.peliosis; [L. fr. G. porphyra, purple]
acute vascular p. Henoch-Schönlein p
allergic p. nonthrombocytopenic p. due to sensitization to foods, drugs, and insect bites.anaphylactoid p. (1);
anaphylactoid p. 1. allergic p 2. Henoch-Schönlein p
p. angioneurot´ica an eruption marked by angioneurotic edema, petechiae, and hyperesthesia of the skin and gastric mucous membrane.
p. annula´ris telangiecto´des asymptomatic annular lesions, principally of the lower extremities of adolescent males, in which the peripheral portion is composed of purpura or petechiae with brawny staining of hemosiderin deposits and minute telangiectasia.Majocchi's disease;
equine nonthrombocytopenic p. an immune-mediated vasculitis of horses due to immune complex deposition, characteristically as a sequela of strangles.
factitious p. self-induced, often painful, ecchymoses.
fibrinolytic p. p. in which the bleeding is associated with rapid fibrinolysis of the clot.
p. ful´minans a severe and rapidly fatal form of p. hemorrhagica, occurring especially in children, with hypotension, fever, and disseminated intravascular coagulation, usually following an infectious illness.
p. hemorrhag´ica 1. idiopathic thrombocytopenic p 2. a noncontagious malady of horses, which occurs following suppurative infections, characterized by multiple hemorrhages and edema of the subcutaneous and submucous tissues.petechial fever;
Henoch's p. Henoch-Schönlein p
Henoch-Schönlein p. an eruption of nonthrombocytopenic purpuric lesions due to dermal leukocytoclastic vasculitis with IgA in vessel walls associated with joint pain and swelling, colic, and passage of bloody stools, and occurring characteristically in young children; glomerulonephritis may occur during an initial episode or develop later.acute vascular p., anaphylactoid p. (2), hemorrhagic exudative erythema, Henoch's p., Henoch-Schönlein syndrome, p. nervosa, p. rheumatica, Schönlein's disease, Schönlein's p., Schönlein-Henoch syndrome;
hyperglobulinemic p. Waldenström's macroglobulinemia
idiopathic thrombocytopenic p. (ITP) a systemic illness characterized by extensive ecchymoses and hemorrhages from mucous membranes and very low platelet counts; resulting from platelet destruction by macrophages due to an antiplatelet factor; childhood cases are usually brief and rarely present with intracranial hemorrhages, but adult cases are often recurrent and have a higher incidence of grave bleeding, especially intracranial.immune thrombocytopenic p., p. hemorrhagica (1), thrombopenic p;
immune thrombocytopenic p. idiopathic thrombocytopenic p
p. iod´ica , iodic p. an eruption of discrete miliary petechiae, usually confined to the lower extremities, appearing in rare instances on administration of any of the iodides.
p. nervo´sa Henoch-Schönlein p
nonthrombocytopenic p. p. simplex
psychogenic p. autoerythrocyte sensitization syndrome
p. pu´licans , p. pulico´sa petechiae caused by the bites of insects and animal parasites.
p. rheumat´ica Henoch-Schönlein p
Schönlein's p. Henoch-Schönlein p
p. seni´lis the occurrence of petechiae and ecchymoses on the atrophic skin of the legs in aged and debilitated subjects.
p. sim´plex the eruption of petechiae or larger ecchymoses, usually unaccompanied by constitutional symptoms and not associated with systemic illness.nonthrombocytopenic p;
p. symptomat´ica a petechial eruption in scarlet fever and other exanthemas.
thrombocytopenic p. See idiopathic thrombocytopenic p.
thrombopenic p. idiopathic thrombocytopenic p
thrombotic thrombocytopenic p. a rapidly fatal or occasionally protracted disease with varied symptoms in addition to p., including signs of central nervous system involvement, due to formation of fibrin or platelet thrombi in arterioles and capillaries in many organs.Moschcowitz' disease;
p. urti´cans p. simplex accompanied by an urticarial eruption.
Waldenström's p. Waldenström's macroglobulinemia

 

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