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Neoplastic pleocytosis in a dog with metastatic mammary carcinoma and meningeal carcinomatosis
Author(s) -
BehlingKelly Erica,
Petersen Sophie,
Muthuswamy Anantharaman,
Webb Julie L.,
Young Karen M.
Publication year - 2010
Publication title -
veterinary clinical pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.537
H-Index - 51
eISSN - 1939-165X
pISSN - 0275-6382
DOI - 10.1111/j.1939-165x.2009.00211.x
Subject(s) - pathology , meningeal carcinomatosis , medicine , cytokeratin , cerebrospinal fluid , metastasis , metastatic carcinoma , mammary tumor , carcinosis , carcinoma , brain metastasis , primary tumor , cancer , immunohistochemistry , breast cancer , peritoneal carcinomatosis , colorectal cancer
A 12‐year‐old female spayed Labrador Retriever was presented with a history of seizures and abnormal vocalization. Approximately 1 year before presentation, multiple mammary cysts had been surgically excised. A mammary mass was noted on physical examination, and 2 separate parenchymal brain lesions were found on imaging studies. Cerebrospinal fluid (CSF) collected from the cisterna magna was analyzed, and abnormalities included moderate pleocytosis with atypical discrete round cells that occasionally formed loose clusters. The dog was euthanized, and on necropsy a primary solid mammary carcinoma was identified as well as multiple metastatic foci in the brain with diffuse meningeal involvement. The cells in the CSF had a morphologic appearance similar to the cells in the primary mammary tumor and in the metastatic tumors in the brain. On immunostaining, cells from the primary mammary tumor, the brain tumors, and the CSF expressed cytokeratin. The CSF cells did not express CD18, CD3, or CD79a. A final diagnosis of mammary carcinoma with brain metastasis and meningeal carcinomatosis was made.