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Page 1: A proliferative thrombovascular necrosis in both … proliferative thrombovascular necrosis in both pinnae of a Dalmatian dog. Berrocal, A. Departamento de Patología, Escuela de Medicina

A proliferative thrombovascular necrosis in both pinnae of a Dalmatian dog. Berrocal , A . Depar tamento de Pato logía , Escuela de Medic ina Veterinaria, Universidad Nacional , Heredia, Costa Rica.

Current address: AP-904,Heredia Costa Rica . www.his topatove t .com Presented in the Fourth World Congress of Veterinary Dermatology, 30 August-2 September 2000, San Francisco, California, USA. V e t e r i n a r y D e r m a t o l o g y , V o l . 1 1 S u p p l e m e n t 1 , S e p t e m b e r 2 0 0 0 . I S V D - 7

A 1 . 6 - y e a r - o l d , m a l e D a l m a t i a n d o g w a s p r e s e n t e d f o r e v a l u a t i o n o f l e s i o n s o n t h e m a r g i n s o f t h e a p e x o f b o t h e a r s . T h e o w n e r r e p o r t e d t h a t l e s i o n s h a d b e e n p r e s e n t i n t h e l e f t e a r f o r o n e y e a r a n d i n t h e r i g h t f o r s i x mon ths . P r i o r t r e a tmen t d id no t a l l ev i a t e t he cond i t i on a n d c o n s i s t e d o f t o p i c a l a n t i s e p t i c s o l u t i o n s . U p o n e x a m i n a t i o n t h e l e f t e a r p i n n a s h o w e d u l c e r a t i o n , b l e e d i n g a n d c r u s t i n g , w i t h t h e l e s i o n e x t e n d i n g t o t h e internal pinna. See the fol lowing two photos .

The right ear had s imilar les ions but they were not as moist and active.

A skin biopsy was performed and his to logical examinat ion showed that the e p i d e r m i s e x h i b i t e d a c a n t h o s i s , o r t h o k e r a t o t i c a n d p a r a k e r a t o t i c hyperkera tos is , and hyperpigmenta t ion . The dermis w a s f i l led wi th prol i fera t ive vascular s t ructures separa ted by stromal t i s s u e . The luminal vessels contained erythrocytes and fibrin like material. See the following two pictures.

Page 2: A proliferative thrombovascular necrosis in both … proliferative thrombovascular necrosis in both pinnae of a Dalmatian dog. Berrocal, A. Departamento de Patología, Escuela de Medicina

Base on the clinical presentation and the dermatopathological features, the diagnosis of proliferative thrombovascular necrosis was made.


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