NBDE Quiz # 71
NBDE practice questions
squamous cells may spread into deeper tissue as the cancer grows. Squamous cell carcinoma usually develops in areas of leukoplakia (white patches of cells that do not rub off). Lip and oral cavity cancer is a type of head and neckcancer.
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NBDE Quiz # 71
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1. Question
Which of the following is the most common site of squamous cell carcinoma of the oral cavity?
CorrectThe correct response is E. The tongue is the most common site of squamous cell carcinoma of the oral cavity. Tongue carcinoma occurs most often in elderly persons but has been seen in adolescents and young adults. Excess alco¬hol and tobacco use are thought to be associ¬ated. Approximately 36% of all squamous cell carcinomas of the oral cavity affect the tongue.
In contrast, 30% of all oral squamous cell carcinomas involve the floor of the mouth, 16% involve the mandibular gingiva, and 10% in-volve the buccal mucosa, while only 3% in¬volve the palate. Sites most likely to be affected by tongue carcinomas include the anterior two- thirds, lateral borders, and ventral surface of the tongue; lesions affecting the midline or dorsal surface are rare. Approximately 33% of these tumors arise behind the circumvallate papilla. Because tongue carcinomas are typically pain-less, affected persons often do not seek treat-ment until the tumor becomes advanced and begins to ulcerate and/or cause pain or difficul-ties with speech or swallowing. Tumor progres-sion correlates directly with the size and extent of invasion of the tumor into the tongue mus-cles. Patients with extensive muscle infiltration typically have restricted tongue movement.
Approximately 30% of patients with tongue carcinomas have lymph node metastases at initial presentation. The midjugular, subdigas-tric, and submandibular lymph nodes are most likely to be affected, while the lower jugu¬lar, submental, and posterior cervical triangle nodes are rarely involved.IncorrectThe correct response is E. The tongue is the most common site of squamous cell carcinoma of the oral cavity. Tongue carcinoma occurs most often in elderly persons but has been seen in adolescents and young adults. Excess alco¬hol and tobacco use are thought to be associ¬ated. Approximately 36% of all squamous cell carcinomas of the oral cavity affect the tongue.
In contrast, 30% of all oral squamous cell carcinomas involve the floor of the mouth, 16% involve the mandibular gingiva, and 10% in-volve the buccal mucosa, while only 3% in¬volve the palate. Sites most likely to be affected by tongue carcinomas include the anterior two- thirds, lateral borders, and ventral surface of the tongue; lesions affecting the midline or dorsal surface are rare. Approximately 33% of these tumors arise behind the circumvallate papilla. Because tongue carcinomas are typically pain-less, affected persons often do not seek treat-ment until the tumor becomes advanced and begins to ulcerate and/or cause pain or difficul-ties with speech or swallowing. Tumor progres-sion correlates directly with the size and extent of invasion of the tumor into the tongue mus-cles. Patients with extensive muscle infiltration typically have restricted tongue movement.
Approximately 30% of patients with tongue carcinomas have lymph node metastases at initial presentation. The midjugular, subdigas-tric, and submandibular lymph nodes are most likely to be affected, while the lower jugu¬lar, submental, and posterior cervical triangle nodes are rarely involved.