Flashcards in 2. Benign Tumors Deck (161)
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1
A round/oval, well circumscribed uniformly opaque calcific radiopacity that arises in membranous bones
Osteoma
(usually less than 2 cm)
2
MC benign tumor of nose and paranasal sinuses
Osteoma
3
found in paranasal sinuses, inner and outer skull tables
Osteoma
4
Fills the entire sinus
and may cause ocular disturbances, headaches, and sinusitis
Giant Osteomas
5
Mandibular Osteoma will cause
Mechanical and cosmetic problems
6
Osteomas may be associated with what syndrome?
Gardner’s Syndrome
7
Colonic polyposis, soft tissue fibromas, and multiple osteomas that are protuberant, oval, dense.
Gardener’s Syndrome:
8
Discrete area of sclerosis in located anywhere (except skull)
Bone Island (Enostoma)
9
Bone islands are symptomatic or Asymptomatic?
Asymptomatic and clinically insignificant
10
what distinguishes a Bone Island from blastic metastasis?
Brush border
11
bone islands affect what part of the bone?
Epiphysis and metaphysis but NOT the diaphysis
12
A giant bone island is larger than
1.0cm
13
DDx for Bone Island: (Enostoma)
• Blastic metastasis
• Osteoid osteoma
• Osteoma
• Osteopoikilosis
14
Bone Island are possibly caused by cortical bone that has failed to undergo __________ during the process of endochondral
ossification
medullary
resorption
15
Bone islands typically appear
as
round-to-ovoid sclerotic
intramedullary foci
16
The long axis of the bone
island is aligned ______ to
the long axis of the bone
parallel
17
Bone islands are composed of
cortical bone and appear as what signal intensity?
low signal intensity on MRI on all pulse sequences
18
Do bone islands typically appear "hot"
on bone scans?
NO
19
Radiolucent nidus with surrounding reactive
sclerosis in 10-25 yo.
Osteoid Osteoma
20
Pain from an osteoid osteoma is relieved by
aspirin
21
Gradual severe deep aching pain than can be referred to a nearby joint, worse at night, with Limited ROM, painful limp, stiffness, and weakness
Osteoid Osteoma
22
Painful rigid scoliosis from an Osteoid Osteoma is usually on the ______ side
of curve
concave
23
What bones does an osteoid osteoma affect?
50% in tibia and femur and 10% in spine
24
Osteoid Osteomas are
usually less than
1.0 cm
25
Highly vascularized fibrous connective tissue in osteoid osteomas
nidus (may not be seen)
26
may need what to Dx osteoid osteoma?
CT
27
Intramedullary OO do not produce much sclerosis
except the sclerosis
outside of the capsular bone region
28
Helps show bone edema around the nidus
MRI
29
Very high levels of have _________ been found in the
osteoid osteoma lesion
prostaglandins
30
