Pulse - November 2022 - 17

PRACTICAL PATHOLOGY
Oral Teratoma in Cats
Farshid Shahriar DVM, PhD, DACVP - Lore Laboratory, Tustin, CA
History and clinical findings:
A 5-month-old male kitten presented with a large mass on left
oral cavity. Sections of the growth were submitted for histological
examination to the diagnostic laboratory for further investigation.
Histopathologic findings:
The mass exhibits evidence of a teratoma composed of ectodermal,
endodermal, and mesenchymal elements. There are ectodermal
pilosebaceous units (Fig. 1) haphazardly intermixed with
mesodermal elements which consist of bundles of skeletal muscle,
adipocytes tissue and foci of cartilage and bone formation (Fig.
2). Small foci of neural elements are present (Fig. 3). Endodermal
elements include tiny foci of glandular material which are either
lined by a single layer of cuboidal epithelium with multifocal subjacent
tubules or pseudostratified columnar epithelium. There are a
few widely scattered aggregates of small lymphocytes multifocally.
Diagnosis:
Diagnosis of mature type oral teratoma with 80% differentiation
was made according to the histological features.
Discussion:
Teratomas originate from the embryonic notochord, which are
normally located in germinal tissue such as the ovary or testis, but
can arise in the retroperitoneal space, intracranial and spinal column,
perianal and retrobulbar region, head and neck, etc. They
originate from pluripotent germ cells that undergo somatic differentiation
into two or usually three embryonic germ cell layers,
and a variety of mature tissues arranged chaotically throughout
the tumor. Any combination of ectodermal (skin and appendages),
mesodermal (osseous, cartilaginous, adipose, or muscle structures),
and endodermal tissues (glandular tissues) are seen. Expansile oral
teratoma may interfere with the mastication, facial nerve, or salivary
gland ducts, etc. and needs to be examined by nearby structures.
Metastasis to the abdominal viscera, lymph nodes, bone and
lungs occurs in around 33 - 50% of malignant teratomas in certain
species, but there is no diagnostic evidence of malignancy in this
mature teratoma. P
References:
Bart Van Goethem, Tim Bosmans, Koen Chiers. Surgical Resection of a Mature Teratoma
on the Head of a Young Cat. J Am Anim Hosp Assoc 2010;46:121-126.
Rochat MC, Campbell GA, Panciera RJ: Dermoid cysts in cats: two cases and a review of
the literature. J Vet Diagn Invest 1996, 8:505-507.
Chénier S, Quesnelm A, Girard C: Intracranial teratoma and dermoid cyst in a kitten. J Vet
Diagn Invest 1998, 10:381-384.
Wray JD, Doust RT, McConnell F, Dennis RT, Blunden AS: Retrobulbar teratoma causing
exophthalmos in a cat. J Feline Med Surg 2008, 10:175-180. 11.
Figure 2
Figure 1
Figure 3
PULSE
NOVEMBER 2022
17

Pulse - November 2022

Table of Contents for the Digital Edition of Pulse - November 2022

Pulse - November 2022
Chapter Meetings & Calendar
President’s Perspective
Pulsepoints
Dimensions in Surgery & Critical Care
Are We Facing a Dog Shortage?
Practical Pathology
UC Davis Update
PULSE Special Section
Tools for Success
Angel Fund
The RVT
Industry Insights
AVMA Diplomates
Digital Photography for Veterinarians
Resources
Disease Table
From the SCVMA Office
Pulse - November 2022 - Pulse - November 2022
Pulse - November 2022 - Cover2
Pulse - November 2022 - 1
Pulse - November 2022 - 2
Pulse - November 2022 - Chapter Meetings & Calendar
Pulse - November 2022 - President’s Perspective
Pulse - November 2022 - Pulsepoints
Pulse - November 2022 - 6
Pulse - November 2022 - 7
Pulse - November 2022 - 8
Pulse - November 2022 - Dimensions in Surgery & Critical Care
Pulse - November 2022 - 10
Pulse - November 2022 - 11
Pulse - November 2022 - Are We Facing a Dog Shortage?
Pulse - November 2022 - 13
Pulse - November 2022 - 14
Pulse - November 2022 - 15
Pulse - November 2022 - 16
Pulse - November 2022 - Practical Pathology
Pulse - November 2022 - UC Davis Update
Pulse - November 2022 - PULSE Special Section
Pulse - November 2022 - 20
Pulse - November 2022 - Tools for Success
Pulse - November 2022 - Angel Fund
Pulse - November 2022 - The RVT
Pulse - November 2022 - 24
Pulse - November 2022 - Industry Insights
Pulse - November 2022 - AVMA Diplomates
Pulse - November 2022 - Digital Photography for Veterinarians
Pulse - November 2022 - Resources
Pulse - November 2022 - Disease Table
Pulse - November 2022 - 30
Pulse - November 2022 - 31
Pulse - November 2022 - 32
Pulse - November 2022 - 33
Pulse - November 2022 - 34
Pulse - November 2022 - 35
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Pulse - November 2022 - From the SCVMA Office
Pulse - November 2022 - 49
Pulse - November 2022 - 50
Pulse - November 2022 - 51
Pulse - November 2022 - 52
Pulse - November 2022 - Cover3
Pulse - November 2022 - Cover4
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