MJDF Oral & Dental Pathology

Question 1

What is the histological hallmark of an odontogenic keratocyst (OKC)?

Accepted Answer

Thin parakeratinised epithelium (6–8 cell layers) with a basal layer of palisaded cells and a corrugated surface

Answer

Thick orthokeratinised epithelium

Answer

Dense inflammatory infiltrate throughout wall

Answer

Cholesterol clefts in the lumen

Question 2

What is the most common benign odontogenic tumour?

Accepted Answer

Ameloblastoma

Answer

Odontoma

Answer

Adenomatoid odontogenic tumour

Answer

Calcifying epithelial odontogenic tumour

Question 3

What radiographic feature distinguishes a radicular cyst from a periapical granuloma?

Accepted Answer

Corticated (well-defined) border around a fluid-filled radiolucency in radicular cyst; granuloma is diffuse

Answer

Radicular cysts always calcify

Answer

Granulomas are larger than 2 cm always

Answer

Radicular cysts are radiopaque

Question 4

What is the most common oral manifestation of HIV infection?

Accepted Answer

Pseudomembranous candidiasis (oral thrush) and linear gingival erythema

Answer

Acute necrotising ulcerative gingivitis only

Answer

Oral hairy leukoplakia (EBV) on buccal mucosa

Answer

Kaposi's sarcoma always

Question 5

What is the pathological significance of a low-grade mucoepidermoid carcinoma?

Accepted Answer

Most common malignant salivary gland tumour; low-grade has good prognosis with surgery

Answer

Universally fatal within 5 years

Answer

Benign and requires no treatment

Answer

Only affects the sublingual gland

Question 6

What is the characteristic microscopic appearance of a pleomorphic adenoma?

Accepted Answer

Mixed epithelial and mesenchymal-like stroma (chondromyxoid stroma) with tubular structures

Answer

Uniform acinar cells with clear cytoplasm

Answer

Inflammatory cells and necrosis

Answer

Pure squamous epithelium