NBDE Oral Pathology and Radiology 4

Question 1

Oral submucous fibrosis, a potentially malignant disorder, is strongly associated with the habit of:

Accepted Answer

Areca nut (betel quid) chewing

Answer

Areca nut (betel quid) contains arecoline, which stimulates fibroblasts to produce excess collagen, causing progressive submucosal fibrosis and trismus.

Question 2

Stafne bone cavity (static bone cyst) characteristically appears on a panoramic radiograph as:

Accepted Answer

Well-defined unilocular radiolucency below the inferior alveolar canal near the mandibular angle

Answer

Stafne bone cavity is a developmental corticated depression in the posterior mandible lingual cortex below the inferior alveolar canal, filled with submandibular gland tissue.

Question 3

A Wickham's striae pattern on buccal mucosa with white lace-like striations is pathognomonic of:

Accepted Answer

Lichen planus

Answer

Wickham's striae — interlacing white lines on a violaceous background — are the hallmark of oral lichen planus, representing saw-tooth rete pegs and band-like lymphocytic infiltrate.

Question 4

On a periapical radiograph, which structure appears as a radiopaque line at the midline of the palate just superior to the anterior teeth?

Accepted Answer

Median palatal suture

Answer

The median palatal suture appears as a thin radiopaque midline line between the two palatine processes of the maxilla, superior to the central incisors.

Question 5

Which of the following salivary gland tumors is most likely to undergo malignant transformation?

Accepted Answer

Pleomorphic adenoma

Answer

Pleomorphic adenoma (mixed tumor) has a 1-5% risk of malignant transformation to carcinoma ex pleomorphic adenoma, especially with long-standing or recurrent lesions.

NBDE - National Board Dental Examination Practice Test

NBDE - National Board Dental Examination Practice Test

NBDE Oral Pathology and Radiology 4