Flashcards in 2. Benign Tumors Deck (161)
A round/oval, well circumscribed uniformly opaque calcific radiopacity that arises in membranous bones
(usually less than 2 cm)
MC benign tumor of nose and paranasal sinuses
found in paranasal sinuses, inner and outer skull tables
Fills the entire sinus
and may cause ocular disturbances, headaches, and sinusitis
Mandibular Osteoma will cause
Mechanical and cosmetic problems
Osteomas may be associated with what syndrome?
Colonic polyposis, soft tissue fibromas, and multiple osteomas that are protuberant, oval, dense.
Discrete area of sclerosis in located anywhere (except skull)
Bone Island (Enostoma)
Bone islands are symptomatic or Asymptomatic?
Asymptomatic and clinically insignificant
what distinguishes a Bone Island from blastic metastasis?
bone islands affect what part of the bone?
Epiphysis and metaphysis but NOT the diaphysis
A giant bone island is larger than
DDx for Bone Island: (Enostoma)
• Blastic metastasis
• Osteoid osteoma
Bone Island are possibly caused by cortical bone that has failed to undergo __________ during the process of endochondral
Bone islands typically appear
The long axis of the bone
island is aligned ______ to
the long axis of the bone
Bone islands are composed of
cortical bone and appear as what signal intensity?
low signal intensity on MRI on all pulse sequences
Do bone islands typically appear "hot"
on bone scans?
Radiolucent nidus with surrounding reactive
sclerosis in 10-25 yo.
Pain from an osteoid osteoma is relieved by
Gradual severe deep aching pain than can be referred to a nearby joint, worse at night, with Limited ROM, painful limp, stiffness, and weakness
Painful rigid scoliosis from an Osteoid Osteoma is usually on the ______ side
What bones does an osteoid osteoma affect?
50% in tibia and femur and 10% in spine
Osteoid Osteomas are
usually less than
Highly vascularized fibrous connective tissue in osteoid osteomas
nidus (may not be seen)
may need what to Dx osteoid osteoma?
Intramedullary OO do not produce much sclerosis
except the sclerosis
outside of the capsular bone region
Helps show bone edema around the nidus
Very high levels of have _________ been found in the
osteoid osteoma lesion