MFDS Oral Pathology

Question 1

A radiolucent lesion is found at the apex of a non-vital lower premolar.
Histological examination reveals a cyst lined by non-keratinised stratified squamous epithelium with arcading pattern and cholesterol clefts in the wall.
What is the most likely diagnosis?

Accepted Answer

Radicular (periapical) cyst

Answer

Dentigerous cyst

Answer

Odontogenic keratocyst

Answer

Lateral periodontal cyst

Question 2

Which odontogenic tumour is characterised by the histological appearance of ameloblast-like cells arranged in a follicular or plexiform pattern with stellate reticulum-like areas?

Accepted Answer

Ameloblastoma

Answer

Odontoma

Answer

Cementoblastoma

Answer

Myxoma

Question 3

What is the most common malignant tumour of the oral cavity?

Accepted Answer

Squamous cell carcinoma

Answer

Adenoid cystic carcinoma

Answer

Mucoepidermoid carcinoma

Answer

Malignant melanoma

Question 4

A 12-year-old patient presents with a well-defined radiolucent area surrounding the crown of an unerupted lower second premolar. What is the most likely diagnosis?

Accepted Answer

Dentigerous (follicular) cyst

Answer

Radicular cyst

Answer

Ameloblastoma

Answer

Stafne bone cavity

Question 5

What are the histological features that distinguish an odontogenic keratocyst (OKC) from other odontogenic cysts?

Accepted Answer

Thin, regular parakeratinised stratified squamous epithelium (5-8 cells thick) with a corrugated surface, prominent basal layer with palisading, and absence of rete ridges

Answer

Thick, non-keratinised epithelial lining with rete ridges

Answer

Ciliated columnar epithelium resembling respiratory mucosa

Answer

Mucous-secreting epithelium with goblet cells

Question 6

A biopsy of a palatal swelling reveals a tumour composed of a mixture of epithelial and myoepithelial cells in a chondromyxoid stroma. What is the most likely diagnosis?

Accepted Answer

Pleomorphic adenoma (mixed tumour)

Answer

Mucoepidermoid carcinoma

Answer

Warthin tumour

Answer

Acinic cell carcinoma

A radiolucent lesion is found at the apex of a non-vital lower premolar.Histological examination reveals a cyst lined by non-keratinised stratified squamous epithelium with arcading pattern and cholesterol clefts in the wall.What is the most likely diagnosis?

A radiolucent lesion is found at the apex of a non-vital lower premolar.
Histological examination reveals a cyst lined by non-keratinised stratified squamous epithelium with arcading pattern and cholesterol clefts in the wall.
What is the most likely diagnosis?