33 Questions
Which of the following is a common site for keratoacanthoma?
Outer edge of the vermillion border of lips
What is the etiology of keratoacanthoma?
Viral factors (HPV 26, 37)
How does keratoacanthoma clinically present?
Asymptomatic, more common in older males
What is the histopathological feature of keratoacanthoma?
Well-differentiated squamous cell carcinoma
Which of the following is NOT a possible etiology for keratoacanthoma?
Bacterial infection
What is the typical age group for the occurrence of keratoacanthoma?
Older adults, especially males
Which of the following is a possible cause for keratoacanthoma?
Actinic radiation
What distinguishes keratoacanthoma from squamous cell carcinoma histopathologically?
Presence of cystic spaces lined by endothelial cells
Which statement about keratoacanthoma is true?
$ ext{5-10} ext{%}$ of keratoacanthomas regress spontaneously without treatment.
What is a distinguishing feature of keratoacanthoma?
$ ext{It}$ has a central crater filled with keratin.
What differentiates keratoacanthoma from squamous cell carcinoma?
$ ext{Keratoacanthoma}$ does not metastasize, whereas squamous cell carcinoma does.
What distinguishes keratoacanthoma from basal cell carcinoma?
$ ext{Keratoacanthoma}$ resembles well-differentiated squamous cell carcinoma, while basal cell carcinoma does not.
Which of the following benign neoplasms is restricted to the craniofacial skeleton and is rare in other bones?
Osteoma
Which of the following benign neoplasms is characterized by variable abnormalities in bone, skin, and teeth as well as colorectal polyps?
Osteoma
Why is it wise to consider chondroma of the jaw as a potential chondrosarcoma?
Because the microscopic distinction between benign chondroma and low-grade chondrosarcoma of the jaw is difficult
Which condition presents as a tumor-like condition characterized by the presence of normal tissue in an exaggerating manner?
Hamartoma
Which benign neoplasm is a benign vascular hamartoma affecting the mucosa and is considered as a tumor of infancy that shows rapid growth, followed by gradual involution?
Haemangioma
What is the most common site of lymphangioma intraorally?
Anterior 2/3 of the tongue
Which benign neoplasm consists of small blood spaces lined by endothelial cells that are separated by connective tissue stroma?
Haemangioma
Which benign neoplasm arises on the surface of bone causing facial deformity?
Osteoma
Which benign hamartomatus tumorlike growth of lymphatic vessels has a marked predilection to the head & neck?
Lymphangioma
What is characteristic of Gardner’s syndrome?
High risk for transformation of colorectal polyps into adenocarcinoma if untreated
In which condition does a vascular malformation persist throughout life and is present at birth?
Sturge-Weber disease
What is characteristic of a cavernous haemangioma?
Consists of large blood spaces that may show papillary enfolding
Which lesion shows rapid enlargement to its full size of 1-2 cm over 6 weeks?
Keratoacanthoma
What is the characteristic feature of Antoni type A in Schwanoma histopathology?
Palisading arrangement of cells and their nuclei in rows
Which benign neoplasm is believed to be reactive hyperplasia of fibrous connective tissue rather than a true neoplasm?
Fibroma
Which benign neoplasm appears as a sessile mass affecting both males and females at middle age?
Granular cell tumor
What is the most common site for Granular cell tumor?
Tongue
Which benign neoplasm is a slowly growing, asymptomatic, soft swelling with a smooth surface?
Lipoma
What is the differential diagnosis for Granular cell tumor?
Congenital epulis of newborn
Which benign neoplasm is composed of interlacing bundles of spindle-shaped cells with wavy nuclei in delicate connective tissue?
Neurofibroma
What is the lab finding associated with Melanotic neuroectodermal tumor of infancy?
High levels of urinary vanillylmandelic acid
Learn about the histopathological features of benign soft tissue lesions of the oral mucosa including lymphangioma, haemangioma, lipoma, genodermatoses, and local reactive lesions. Understand how histopathology plays a role in the diagnostic process.
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