Rare primary choroidal melanoma in a dog, with optic nerve infiltration / Raro melanoma primário de coroide em cão, com infiltração no nervo óptico

Intraocular melanocytic neoplasms are common in dogs. However, the choroidal location of these neoplasms and their infiltration into the optic nerve are unusual. This paper reports a case of primary choroidal melanoma in a 12-year-old male Dachshund. On the first examination, the animal presented left eye blepharospasm, protrusion of the nictitating membrane, conjunctival hyperemia, moderate congestion, hyphema, and intraocular hypertension. Opacity hindered the performance of fundoscopy in the affected eye. The ocular ultrasound examination revealed a cupuliform mass in the choroid. Due to suspected intraocular neoplasia, an exenteration was performed. Histopathological examination revealed primary choroidal melanoma with scleral and optic nerve invasion.(AU)

Neoplasias melanocíticas intraoculares são comuns em cães, contudo, a localização destas neoplasias na coroide e a infiltração delas no nervo óptico são pouco frequentes. O presente trabalho relata um caso de melanoma de coroide primário em um cão da raça Dachshund, com 12 anos de idade. O animal ao primeiro exame apresentou blefaropasmo no olho esquerdo, protrusão da terceira pálpebra, hiperemia conjuntival, congestão moderada, hifema e pressão intraocular elevada. Opacidade de meios transparentes impediu a realização de fundoscopia no olho acometido. O exame ultrassonográfico ocular revelou massa cupuliforme na coroide. Em razão da suspeita de neoplasia intraocular foi realizada exenteração. No exame histopatológico foi diagnosticado melanoma primário em coroide com invasão escleral e do nervo óptico.(AU)

A rare retrobulbar and chiasmal meningioma in a dog / Meningioma raro retrobulbar e de quiasma óptico em cão

ABSTRACT: A 14-year-old female Dachshund was referred to a veterinary hospital with a history and signalment of head pressing, compulsive walking, and right circling. At ophthalmologic examination, a mature cataract and absence of photomotor reflex in the right eye were observed. The neurological exam revealed multifocal encephalic signs. At necropsy, a conical solid tan mass was observed involving the right optic nerve throughout its extension to the optic chiasm. Histopathological findings confirmed a retrobulbar papillary meningioma, considered rare and seldom included as differential diagnosis in patients with neurological signs.

RESUMO: Uma fêmea Dachshund de 14 anos de idade foi encaminhada para um hospital veterinário universitário com histórico e manifestação de "head pressing", andar compulsivo e em círculos para o lado direito. No exame oftalmológico foi diagnosticado catarata matura bilateral e ausência de reflexo fotomotor pupilar no olho direito. O exame neurológico revelou sinais encefálicos multifocais. Na necropsia, uma massa sólida cônica, branco-amarelada, foi observada envolvendo o nervo óptico em toda a sua extensão até o quiasma óptico. O exame histopatológico confirmou diagnóstico de meningioma papilar retrobulbar, considerado raro e pouco incluído no diagnóstico diferencial de pacientes com sinais neurológicos.

A rare retrobulbar and chiasmal meningioma in a dog / Meningioma raro retrobulbar e de quiasma óptico em cão

A 14-year-old female Dachshund was referred to a veterinary hospital with a history and signalment of head pressing, compulsive walking, and right circling. At ophthalmologic examination, a mature cataract and absence of photomotor reflex in the right eye were observed. The neurological exam revealed multifocal encephalic signs. At necropsy, a conical solid tan mass was observed involving the right optic nerve throughout its extension to the optic chiasm. Histopathological findings confirmed a retrobulbar papillary meningioma, considered rare and seldom included as differential diagnosis in patients with neurological signs.(AU)

Uma fêmea Dachshund de 14 anos de idade foi encaminhada para um hospital veterinário universitário com histórico e manifestação de head pressing, andar compulsivo e em círculos para o lado direito. No exame oftalmológico foi diagnosticado catarata matura bilateral e ausência de reflexo fotomotor pupilar no olho direito. O exame neurológico revelou sinais encefálicos multifocais. Na necropsia, uma massa sólida cônica, branco-amarelada, foi observada envolvendo o nervo óptico em toda a sua extensão até o quiasma óptico. O exame histopatológico confirmou diagnóstico de meningioma papilar retrobulbar, considerado raro e pouco incluído no diagnóstico diferencial de pacientes com sinais neurológicos.(AU)

Squamous cell carcinoma in third eyelid of cat / Carcinoma de células escamosas em terceira pálpebra de felino

Background: The third eyelid neoplasms are uncommon in cats. The squamous cell carcinoma are easily found in head and neck of same species, although is unusual in eye region. The more common localization is eyelid and eyeball, being 60 and 15%, respectively. It could be diagnosed by citology, histopathology, imunohistochemistry and molecular biology. The surgery is more effective treatment, because the tumor can be totally removed and it must available surgical margin. The aim of this study was to report a case of squamous cell carcinoma in third eyelid of a cat and show how it was treated with radical surgery.Case: A 11-year-old spayed female domestic short-haired white and black colored cat was presented for evaluation at Maria Dias Teixeira Hospital of Amazonia Federal Rural University (UFRA), of an red ocular mass fast growth in the left eye for 2 months. Physical exam was within normal limits. The animal presented discomfort on the region, when it was manipulated. The mass was ulcerated and blood-tinged ocular discharge, had 3.3 x 2 cm, beginning on third eyelid and overlay all the eyeball. Blood was collated to make exams. Complete blood count and serum chemistry profiles were within normal ranges, but leukocytes were increased and it was treated with Amoxicillin (22 mg/kg). It was performed biopsy to histopathology and immunohistochemistry diagnose, and radiography and [...](AU)

Squamous cell carcinoma in third eyelid of cat / Carcinoma de células escamosas em terceira pálpebra de felino

Background: The third eyelid neoplasms are uncommon in cats. The squamous cell carcinoma are easily found in head and neck of same species, although is unusual in eye region. The more common localization is eyelid and eyeball, being 60 and 15%, respectively. It could be diagnosed by citology, histopathology, imunohistochemistry and molecular biology. The surgery is more effective treatment, because the tumor can be totally removed and it must available surgical margin. The aim of this study was to report a case of squamous cell carcinoma in third eyelid of a cat and show how it was treated with radical surgery.Case: A 11-year-old spayed female domestic short-haired white and black colored cat was presented for evaluation at Maria Dias Teixeira Hospital of Amazonia Federal Rural University (UFRA), of an red ocular mass fast growth in the left eye for 2 months. Physical exam was within normal limits. The animal presented discomfort on the region, when it was manipulated. The mass was ulcerated and blood-tinged ocular discharge, had 3.3 x 2 cm, beginning on third eyelid and overlay all the eyeball. Blood was collated to make exams. Complete blood count and serum chemistry profiles were within normal ranges, but leukocytes were increased and it was treated with Amoxicillin (22 mg/kg). It was performed biopsy to histopathology and immunohistochemistry diagnose, and radiography and [...]

Corneal squamous cell carcinoma in a dog

Squamous cell carcinoma (SCC) is a neoplastic disease of the squamous epithelial cells that has been rarely described in the literature. This neoplasm affects the eyelid, conjunctiva and third eyelid, as well as the cornea. Corneal SCC is a neoplastic lesion characterized by a pink, typically irregular mass protruding from the epithelial surface of the cornea. Canine corneal SCC has been associated with chronic keratoconjunctivitis sicca, or keratitis secondary to exophthalmia and is common in humans, horses and cows. The treatment is surgical with excision of the lesion of the ocular surface. This paper reported a study of a dog with corneal SCC, which was successfully treated with a superficial lamellar keratectomy excision combined with cryosurgery.(AU)

Corneal squamous cell carcinoma in a dog

Squamous cell carcinoma (SCC) is a neoplastic disease of the squamous epithelial cells that has been rarely described in the literature. This neoplasm affects the eyelid, conjunctiva and third eyelid, as well as the cornea. Corneal SCC is a neoplastic lesion characterized by a pink, typically irregular mass protruding from the epithelial surface of the cornea. Canine corneal SCC has been associated with chronic keratoconjunctivitis sicca, or keratitis secondary to exophthalmia and is common in humans, horses and cows. The treatment is surgical with excision of the lesion of the ocular surface. This paper reported a study of a dog with corneal SCC, which was successfully treated with a superficial lamellar keratectomy excision combined with cryosurgery.