Pulse - July 2022 - 13

PRACTICAL PATHOLOGY
Synovial Lipomatosis
Farshid Shahriar DVM, PhD, DACVP - Lore Laboratory, Tustin, CA
Young Joo Kim, DVM - Central Orange County Emergency Animal Hospital, Newport Beach
Medical history and clinical findings:
Biopsies submitted from a nine year old
dog treated with a TPLO for left cranial
cruciate ligament rupture. During the surgery,
a 2x1.5 cm irregularly shaped soft tissue
mass was hanging from the synovial
membrane. The growth was excised and
saved for a histopathologic exam.
Histopathologic findings:
This is a proliferation of synovial membrane
epithelium with folded surface covered
with cuboidal epithelium with areas
of erosion, hyperplasia and edema. The
submucosal areas is covered with focal and
diffuse infiltration by mature adipocytes,
many lipid laden macrophages / lipogranulomas
and mature fibrosis (Fig. 1). The
subepithelial tissue showed mature fat cells
in all areas. There are showed focal lymphocytic
infiltrates often in mucosal and
submucosal areas associated with areas of
erosion or hyperplasia of the lining epithelium
(Fig. 2, 3). Areas of variable lytic
necrosis is noticed within the center parenchyma.
Deep margin is highly vascularized.
No malignancy is observed.
Diagnosis:
Diagnosis of a synovial lipomatosis with
superficial erosion and hyperplasia was made.
Figure 2
Discussion:
Synovial lipomatosis is an uncommon
tumor-like lesion of the synovium, usually
affecting the suprapatellar pouch of
the knee joints. The lesion has also known
as villous lipomatous proliferation of the
synovium or lipoma arborescens. The
etiology of this condition is unknown
although trauma, inflammation, rheumatism
and developmental and neoplastic
processes are implicated. Prognosis is good
with surgical removal. P
Figure 1
Figure 3
PULSE
JULY 2022
13

Pulse - July 2022

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

Pulse - July 2022
Chapter Meetings & Calendar
President’s Perspective
Pulsepoints
SCVMA Profile
COVER FEATURE STORY
Practical Pathology
UC Davis Update
Tools for Success
Angel Fund
The RVT
Industry Insights
Quick Reference
AVMA Diplomates
Digital Photography for Veterinarians
Resources
Disease Table
From the SCVMA Office
Pulse - July 2022 - Pulse - July 2022
Pulse - July 2022 - Cover2
Pulse - July 2022 - 1
Pulse - July 2022 - 2
Pulse - July 2022 - Chapter Meetings & Calendar
Pulse - July 2022 - President’s Perspective
Pulse - July 2022 - Pulsepoints
Pulse - July 2022 - 6
Pulse - July 2022 - 7
Pulse - July 2022 - 8
Pulse - July 2022 - SCVMA Profile
Pulse - July 2022 - COVER FEATURE STORY
Pulse - July 2022 - 11
Pulse - July 2022 - 12
Pulse - July 2022 - Practical Pathology
Pulse - July 2022 - UC Davis Update
Pulse - July 2022 - Tools for Success
Pulse - July 2022 - Angel Fund
Pulse - July 2022 - The RVT
Pulse - July 2022 - Industry Insights
Pulse - July 2022 - Quick Reference
Pulse - July 2022 - AVMA Diplomates
Pulse - July 2022 - Digital Photography for Veterinarians
Pulse - July 2022 - 22
Pulse - July 2022 - 23
Pulse - July 2022 - 24
Pulse - July 2022 - Resources
Pulse - July 2022 - Disease Table
Pulse - July 2022 - 27
Pulse - July 2022 - 28
Pulse - July 2022 - 29
Pulse - July 2022 - 30
Pulse - July 2022 - 31
Pulse - July 2022 - 32
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Pulse - July 2022 - 43
Pulse - July 2022 - From the SCVMA Office
Pulse - July 2022 - Cover3
Pulse - July 2022 - Cover4
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