Tonsillar Lymphangiomatous Polyp in an Adult Dog

Miller, Andrew D.; Alcaraz, Ana; McDonough, Sean P.

doi:10.1016/j.jcpa.2007.12.003

Cited by 11 publications

(15 citation statements)

References 9 publications

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“…The differential diagnosis for tonsillar enlargement without associated lymphadenomegaly also includes several benign pathologies. Tonsillar lesions such as lymphangiomatous polyp and epithelial cyst have been reported . A study gathering eight dogs with tonsillar polyps, mostly found incidentally, did not describe any lymphadenomegaly .…”

Section: Discussionmentioning

confidence: 99%

Computed tomographic appearance of canine tonsillar neoplasia: 14 cases

Thierry

Longo

Pecceu

et al. 2017

Vet Radiology Ultrasound

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The palatine tonsil is an uncommon site of oral canine neoplasia. For affected tonsils, squamous cell carcinoma is the most frequent type of neoplasia, followed by melanoma and lymphoma. Computed tomography (CT) is increasingly used for investigation of canine oropharyngeal pathology; however, limited information is available on the CT appearance of tonsillar neoplasms. Objectives of this retrospective descriptive case series were to characterize the CT features of canine tonsillar neoplasia and determine whether specific CT features differentiate nonneoplastic from neoplastic tonsils. Computed tomographic studies of 14 dogs diagnosed with tonsillar neoplasia were retrieved from two referral hospitals and reviewed by two observers. Diagnosis was based on histology or cytology. Carcinoma was diagnosed in 11 dogs, melanoma in two and lymphoma in one dog. Specific CT features of the tonsil and regional lymph nodes did not differentiate neoplastic from nonneoplastic tonsillar diseases, but regional lymph node CT features were useful for diagnosis in some cases. Marked enlargement (width ≥ 18 mm, 12/18), heterogeneity (16/18), and loss of the hypoattenuating hilus (18/18) of the medial retropharyngeal lymph node were common concomitant features of tonsillar neoplasia. The medial retropharyngeal and mandibular lymphadenomegaly was ipsilateral to the neoplastic tonsil in 8/12 and 6/9 dogs, respectively. Five dogs demonstrated little or no enlargement of the tonsil despite the associated metastatic lymphadenomegaly. Tonsillar neoplasia should therefore be considered as a differential diagnosis for dogs with CT evidence of isolated medial retropharyngeal lymphadenomegaly (regardless of normally sized tonsils), or of any enlarged tonsil with no associated lymphadenomegaly.

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Section: Discussionmentioning

confidence: 99%

Computed tomographic appearance of canine tonsillar neoplasia: 14 cases

Thierry

Longo

Pecceu

et al. 2017

Vet Radiology Ultrasound

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“…1 Individual tonsillar neoplasia case reports in dogs include benign polyps, cysts, a plasmacytoma and a mast cell tumour (MCT). [6][7][8][9][10] Only melanoma has been mentioned to metastasize to the tonsils in dogs, without citation to literature. 11 Specific to human tonsillar melanomas, the presence or absence of junctional activity in the adjacent mucosa on histopathology can differentiate between primary vs metastatic melanoma, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Lymphoma is reported to classically consists of bilateral tonsil involvement along with diffuse lymphadenopathy 1 . Individual tonsillar neoplasia case reports in dogs include benign polyps, cysts, a plasmacytoma and a mast cell tumour (MCT) 6‐10 . Only melanoma has been mentioned to metastasize to the tonsils in dogs, without citation to literature 11 .…”

Section: Introductionmentioning

confidence: 99%

Canine tonsillar neoplasia and tonsillar metastasis from various primary neoplasms

Mickelson

Regan

Randall

et al. 2020

Vet Comparative Oncology

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Tonsillar metastasis from distant primary tumours has not been described in dogs, and reports are rare in humans. The aims of this study were to determine whether tumour metastasis occurs to the canine palatine tonsils and evaluate whether afferent lymphatics drain to the palatine tonsils via skull indirect computed tomography lymphangiography (ICTL). Retrospective review of the diagnostic laboratory tonsillar histopathology submissions was performed. ICTL studies (n = 53) were retrospectively reviewed by a single radiologist. Of 882 total tonsil histopathology samples, 492 (56%) were considered neoplastic, with 8% of them benign. Of the primary malignant neoplasms of the tonsil, squamous cell carcinoma (55%), lymphoma (17%) and melanoma (12%) were most common. Tonsillar metastasis was confirmed in 41 cases; histopathologic evaluation revealed melanoma (25), carcinoma (10), hem

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“…Only 10 canine tonsillar polyps and an epithelial cyst have been reported, among 3 publications and a conference proceeding. 3,5,11,13 Histologically, most of the lesions are composed of mature fibrovascular stroma with multifocal aggregates of lymphocytes and plasma cells, and have been defined as inflammatory polyps. 11,20 Predominance of dilated lymphatic vessels within a dense fibrovascular stroma have been described only rarely.…”

mentioning

confidence: 99%

“…11,20 Predominance of dilated lymphatic vessels within a dense fibrovascular stroma have been described only rarely. 3,13…”

mentioning

confidence: 99%

Canine Tonsillar Polyps: Characteristics, Classification, and Review of the Pathogenesis

Molín

Vilafranca²,

Suárez‐Bonnet

et al. 2020

Vet Pathol

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Canine tonsillar polyps are uncommon. We describe 14 tonsillar polyps in dogs and review their classification and pathogenesis. All dogs were adult (3–13 years old). Females (10/14) were more affected than males (4/14). Most of the lesions were asymptomatic (10/14). All lesions were unilateral, pedunculated (9/14), or sessile (5/14), with a smooth (12/14) or papillary/verrucous surface (2/14). Histologically, polyps consisted of benign proliferation of lymphatic vessels, blood vessels, fibrous tissue, and lymphoid tissue in variable proportions, with occasional adipose tissue (4/14). According to the main stromal components, polyps were categorized as lymphangiomatous (5/14), lymphangiolipomatous (2/14), lymphangiofibromatous (2/14), angiofibromatous (1/14), angiofibrolipomatous (1/14), lymphoid (2/14), and myxomatous (1/14). As the pathogenesis of these polyps remains unclear, we propose to replace the term inflammatory tonsillar polyp by a morphological diagnosis based on the stromal characteristics of the lesions. Simple surgical excision was curative in the 9 cases with available follow-up information.

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Tonsillar Lymphangiomatous Polyp in an Adult Dog

Cited by 11 publications

References 9 publications

Computed tomographic appearance of canine tonsillar neoplasia: 14 cases

Computed tomographic appearance of canine tonsillar neoplasia: 14 cases

Canine tonsillar neoplasia and tonsillar metastasis from various primary neoplasms

Canine Tonsillar Polyps: Characteristics, Classification, and Review of the Pathogenesis

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