Malignant Ct Tumors 2

Question 1

Most common primary malignant tumor of bone

Answer 1

Osteosarcoma

Question 2

Clinical similarity between soteosarcoma and chondrosarcoma

Answer 2

-both at age 33y
-both slowly growing
-cause nasal obstruction if in maxilla
- cause parathesia and loosening and resorption of roots of teeth
- more in males
-

Question 3

Clinical differences between soteosarcoma and chondrosarcoma

Answer 3

-osteo
..Painful
..3 to 4 cm

Chondrosarcoma
.. cause epistaxis

Question 4

Xray similarity between soteosarcoma and chondrosarcoma

Answer 4

• start by widening of pdl
• resorption of roots
• ill defined rl lesion
• sunburst appearance in occ film (osteosarcoma in 25% of cases )

Question 5

Xray Differences between soteosarcoma and chondrosarcoma

Answer 5

Chondrosarcoma
-could be mixed scattered ro
Or lobulated

Question 6

Jaw metastasis are mostly from 1ry tumor in

Answer 6

Metastases to the jaws of adults mainly originate frum primary carcinomres of the breast In

women and of the lung in men

Prostate. gastrointestinal tract,kidney colon rectum
In descending order

Question 7

Percent of metastasis to jaw parts

Answer 7

Sitemandible (805%) in premolar molar region, the angle, and the body of the mandible while

24% to maxilla and 5% to both jaws

Question 8

Xray pic of metastasis

Answer 8

Lesions appear usually as poorly defined, imegular radiolucent areas (moth eaten).)

Some metastatic carcinomas (prostate and thyroid)

are characterized by osteoblastic process new bone formation appear either a mixed or radiopoque leslan.

Question 9

Cytojeratin

Answer 9

cytokeratin present in all carcinoma cells confirming the epithelial origin of undifferentiated

tumors