Oral Radiology - Assignment #1

1. The differential diagnosis for Lateral Periodontal Cyst, one of this is correct about the
border of maxillary sinus, Respectively:

A) Small O.K.C + lateral : zygomatic bone.

B) L.R.C + dorsal : nasal cavity.
C) Small Neurofibroma + roof : root of teeth.
D) Obturator foramen + roof : infraornitals.

2. From this cyst (keratinized Odontogenic Tumor, Dentigerous Cysts, Lateral periodontal
cyst) give the Internal structure, Respectively:

A) Radiolucent except for apparent internal septa, radiolucency except for the associated
crown, radiolucency multilocular.
B) Radiolucency btw root adjacent teeth, radiolucency btw root adjacent teeth, radiolucent
except for apparent internal septa.
C) Radiolucent except for apparent internal septa, radiolucency unilocular, radiolucency
except for the associated crown.
D) Radiolucent except for apparent internal septa, radiolucency except for the
associated crown, radiolucency unilocular.

*Compare it with one number Lateral periodontal cyst the true is unilocular when multilocular lateral
periodontal cyst is referred to as a botryoidal odontogenic cyst*

3. All of this that DEVELOPMENTAL CYSTS except one and give the location of it:

A) Dentigerous Cysts +. posterior body of the mandible.

B) Lateral periodontal cyst + nasopalatine duct.
C) O.K.C + Maxillary canine.
D) Nasopalatine Duct Cyst + nasopalatine duct.
4. Arrange these photos, respectively:

A B

C D

A) Residual cyst, Lateral periodontal cyst, Buccal Bifurcation cyst, Median Palatal Cyst.
B) Residual cyst, Lateral periodontal cyst, Buccal Bifurcation cyst, Median Palatal Cyst.
C) Buccal Bifurcation cyst, Residual cyst, Median palatal cyst, Lateral periodontal cyst.
D) Residual cyst, Buccal Bifurcation cyst, Lateral periodontal cyst, Median Palatal Cyst.
5. Specifications periapical granuloma all of this except:

A) It's rounded with corticated borders.

B) Non radiolucent.
C) It's like cyst.
D) Diameter less than 1 mm.
E) At the apex of teeth.

1) A + B
2) B + E
3) E + D
4) B + D
5) None of the above

(diameter is less than 1 cm)

6. Which statement/s is/are true?

A) Chronic apical periodontitis may develop into osteomyelitis and radicular cyst.
B) Infected apical periodontitis may develop into radicular cyst but not osteomyelitis.
C) Osteomyelitis may develop from either infected or sterile apical periodontitis.
D) A and C are correct.

7. Which statement/s is/are true?

A) Radicular cyst has developed from odontogenic origin thus extracting the tooth will stop
cyst growth.
B) Radicular cyst is a well-defined corticated radiolucency at the apex of a tooth vital.
C) Radicular cyst and lateral radicular cyst are from the same origin but differ in their
location.
D) Paradental cyst and radicular cyst are from the same origin.
8. Which defects are detected in the figure below?

A) Advanced interproximal caries at the distal surface of mandibular 2 nd premolar, mesial

surface of mandibular 2nd molar and at the distal surface of maxillary 1 st premolar.
B) Root caries at distal surface of mandibular 1st molar and moderate interproximal caries at
the mesial surface of mandibular 2nd molar.
C) Severe interproximal caries at the distal surface of maxillary 2nd premolar and
advanced interproximal caries at the distal surface of mandibular 2 nd premolar.
D) Moderate interproximal caries at the distal surface of maxillary 1 st premolar and the mesial
surface of maxillary 2nd premolar.

9. It usually appears as a V-shaped radio-opaque structure in the midline above the incisive
foramen:

A) Nasal concha.
B) Maxillary tuberosity.
C) Incisive foramen.
D) Anterior nasal spine.
10. Regarding to the figure below, which statement/s is/are true?

A) Severe interproximal caries at the distal surface of 2nd molar and mesial surface of the 3rd
molar.
B) The carious lesions may be a recurrent caries and a periradicular lesion in the mesial root
of the 3rd molar.
C) The radiograph was taken after the patient complaint of spontaneous pain and sensitivity
to percussion.
D) All of the above are correct.

11. All of the following are false regarding to characteristics of periapical abscess except:

A) Accumulation of acute inflammatory cells at the apex of a nonvital teeth and has well
defined border.
B) In radiographical features is ill defined radiolucency, at the apex of the root of a vital tooth.
C) In early stage widening of the PDL is observed and the lamina dura is destruction
then a small sized lesion which may extend to become a large one.
D) A + C.
E) B + C.
12. A 13 years old patient. An abnormality was seen incidentally on conventional
radiographs obtained for planning of orthodontic treatment. Posteroanterior
radiograph shows buccal (lateral) displacement of the third molar by the lesion and
causes minimal resorption to adjacent teeth. What is the diagnosis of this radiographical
X-RAY?

A) Dentigerous cyst
B) Odontogenic keratocyst.
C) Ameloblastoma.
D) Mucus Retention Cyst.
E) None of the above.

13. What is the structure identified by the arrow on this

periapical image?

A) Nasal fossa.
B) Nasal spine.
C) Nasal septum.
D) Nasal concha.
14. The following case is a fluctuant, painless, self-contained superficial mass and.
Treatment is by simple excision, and sometimes the lesions are self-limiting. What is the
differential diagnosis for this case?

A) Mucus retention cyst.

B) Dentigerous cyst.
C) Paradental cyst.
D) Ameloblastoma.
E) Odontogenic keratocyst.

15. Radiolucent band running across the tooth in area not cover by enamel or alveolar bone
(neck of the tooth) because it absorbs less x-ray than areas below and above, this
radiographic features describe:

A) Cervical burnout.
B) Dental caries.
C) Pulp exposure.
D) Periapical lesion.
16. A 26 years old male patient reported to our department complaining of swelling in his
palate. He observed the swelling 1 month back and was insidious in onset, which was of
the same size since then. No pain or discharge associated with swelling. Medical history
was noncontributory, and he is a smoker (8–10 cigarettes/day for 3 years). Oral hygiene
was good with no carious tooth. What is the type of this lesion?

A) Median palatine cyst.

B) Central Giant cell carcinoma.
C) Supranumery tooth follicular cyst.
D) Radicular Cyst.

17. What is the best diagnosis for x-ray film with unilocular radiolucent area associated with
the crown of impacted tooth, well-defined, often has a sclerotic border and aggressive
tooth resorption and attached to the CEJ:

A) Odontogenic keratocyst.
B) Dentigerous cyst.
C) Hyperfollicle cyst.
D) Adenomatoid odontogenic tumor.
18. Pulpitis is considered as clinical assessment not radiographic, except in 2 cases:

A) Pulpitis is in progressive stages.

B) Caries invaded the pulp chamber.
C) Before caries invasion to pulp chamber.
D) Internal resorption in pulp chamber.

1) A + D
2) A + B
3) B + D
4) C + D

19. If the radiograph shows an infection distal to a lower 3rd molar, it will lead to the
formation of:

A) Buccal bifurcation cyst.

B) Paradental cyst.
C) Lateral radicular cyst.
D) Residual cyst.

20. All of the following are true regarding Odontogenic Keratocyst EXCEPT:

A) It has a high recurrence rate due to satellite microcysts & thin epithelial lining.
B) It shows trabeculations radiography.
C) It has Bucco-lingual cortical expansion.
D) It behaves like a tumor.
21. Giving the following radiographic picture, what is the best differential diagnosis of the
lesion. Hint: on clinical examination, relatively there is no swelling (simple swelling).

A) Ameloblastoma.
B) Squamous cell carcinoma.
C) Osteosarcoma.
D) Osteomyelitis.

22. It usually appears as a prominent radiolucent area above or between roots of two central
incisors, the previous radiographic description refers to:

A) Anterior nasal spine.

B) Incisive foramen.
C) Nasal septum.
D) Median palatine suture.

23. Which of the following increase the Mach effect?

A) Increase the difference between two radiopaque structures.

B) Increase the difference between two radiolucent structures.
C) Decrease the difference between two radiopaque structures.
D) Decrease the difference between two radiolucent structures.
24. Which of the following statements are NOT true regarding Radicular cyst & Periapical
abscess?

A) Both originates from the apex of the tooth.

B) Radicular cyst has well-defined corticated borders while Abscess has ill-defined borders.
C) The cyst will cause destruction to the surrounding structures while abscess will cause
displacement.
D) They originate in non-vital tooth.

25. Which of the following observations may be seen in pulpitis case tooth?

A) When pulpal infection reaches the periapical tissues.

B) We can't see pulpitis on radiographs.
C) After formation of secondary dentine (reparative dentin) due to caries.
D) A + B

26. All of the following are sources for non-odontogenic cysts except:

A) Bone.
B) Lymph nodes.
C) Soft tissue.
D) Teeth.

27. Which of the following is not a radiographic feature of osteomyelitis?

A) It has no border.
B) Moth eaten appearance.
C) Presence of sequestrum.
D) None of the above.
28. All of the cyst grow up by osmotic pressure except:

A) Dentigerous cyst.
B) Odontogenic keratocyst.
C) Radicular cyst.
D) Paradental cyst.

29. What do you think the diagnosis likely to be depending on the attached
x-ray?

A) Pseudocyst.
B) Lateral periodontal cyst.
C) Anatomy structure (incisive foramen).
D) None of the above.

30. All are characteristics of a radicular cyst EXCEPT one. Which is the EXCEPTION?

A) The periphery usually has a well-defined cortical border.

B) Most radicular cysts (60%) are found in the maxilla.
C) In most cases the internal structure of radicular cysts is radiolucent.
D) If a radicular cyst is large, displacement and resorption of the roots adjacent teeth may
occur.

31. Clinical examination of a case expose presence of a large occlusal carious lesion of upper
right second molar. Radiographically show a dark, radiolucent area and white sclerotic
line under it. What is the case?

A) Recurrent caries.
B) Radiation caries.
C) Arrested caries.
D) Root surface caries.
32. A lateral periodontal cyst can arise from a preexisting periapical granuloma. A lateral
periodontal cyst is usually seen in the mandibular premolar and canine area and max.
lateral incisor area.

A) The first sentence is correct and the second sentence is wrong.

B) The first sentence is wrong and the second sentence is correct.
C) The two sentences are wrong.
D) The two sentences are correct.

33. Which of the following appears as radiopaque lines curving forward and upward toward
the mandibular midline?

A) The mylohyoid ridge.

B) The internal oblique ridge.
C) The external oblique ridge.
D) The mental ridge.

34. According to this periapical radiograph, what is the special diagnosis of this case?

A) Abscess.
B) Granuloma.
C) Small size radicular cyst.
D) Osteomyelitis.
35. Regarding to the figure below, which statement is true?

A) The periapical radiolucency lacking a well-defined border is a granuloma or radicular cyst.

B) The lesion around the mesial root of the 1st molar is a periapical abscess and is
detected clinically.
C) The lesion around the mesial root of the 1st molar is probably not of a carious origin.
D) This kind of lesions has no sign or symptoms and is detected only radiographically.