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JFMS Open Rep. 2018 Nov 8;4(2):2055116918811179. doi: 10.1177/2055116918811179. eCollection 2018 Jul-Dec.

Invasive nasal histiocytic sarcoma as a cause of temporal lobe epilepsy in a cat.

Author information

Veterinary Referral Practice 'de Pietersberg', Oosterbeek, The Netherlands.
Faculty of Veterinary Medicine, Department of Pathobiology, Utrecht University, The Netherlands.
Faculty of Veterinary Medicine, Ghent University, Belgium.
Faculty of Veterinary Medicine, Department of Clinical Sciences of Companion Animals, Utrecht University, The Netherlands.


Case summary:

A 10-year-old neutered female domestic shorthair cat was presented with an acute onset of neurological signs suggestive of a right-sided forebrain lesion, temporal lobe epilepsy and generalised seizure activity. MRI of the head revealed an expansile soft tissue mass in the caudal nasal passages (both sides but predominantly right-sided) involving the ethmoid bone and extending through the cribriform plate into the cranial vault affecting predominantly the right frontal lobe and temporal lobe. Histopathological examination of the tumour revealed a histiocytic sarcoma.

Relevance and novel information:

This is the first report of a cat with clinical signs of temporal lobe epilepsy due to an invasive, histiocytic sarcoma. Histiocytic sarcoma, although rare, should be included in the list of differential diagnoses for soft tissue masses extending through the cribriform plate. Other differential diagnoses are primary nasal neoplasia (eg, adenocarcinoma, squamous cell carcinoma, chondrosarcoma and other types of sarcomas), lymphoma and olfactory neuroblastoma. Temporal lobe epilepsy in cats can be the consequence of primary pathology of temporal lobe structures, or it can be a consequence of pathology with an effect on these structures (eg, mass effect or disruption of interconnecting neuronal pathways).


Feline epilepsy; complex focal seizures; ethmoid bone; forebrain; histiocytic sarcoma; invasive neoplasm; nasal neoplasia; temporal lobe epilepsy

Conflict of interest statement

Conflict of interest: The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

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