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14284 Pathology

Biopsy of a persistent exophytic area on the vulva of a 60 year old woman demonstrates a squamous epithelial lesion. No koilocytes are seen. The lesions show papillary projections composed of disordered, squamous epithelium with well differentiated cells. The basement membrane at the dermal-epidermal junction is focally disrupted by squamous cell groups extending deep into the dermis. Which of the following diagnoses is most accurate?

ACondyloma acuminatum
BExtramammary Paget's disease
CVulvar intraepithelial neoplasia
DVulvar squamous cell carcinoma
Pathology
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14285 Pathology

An 86-year-old man has become progressively unable to live independently for the past 10 years, and he now requires assistance with bathing, dressing, toileting, feeding, and transfers in and out of chairs and bed. On physical examination, he has no motor or sensory deficits. He cannot give the current date or state where he is. Six months later, he suddenly becomes comatose and dies. At autopsy, there is a large superficial left parietal lobe hemorrhage. Histologic examination of the brain shows numerous neocortical neuritic plaques and neurofibrillary tangles. The peripheral cerebral arteries and the core of each plaque stain positively with Congo red. Which of the following mechanisms is most likely responsible for his disease?

AAggregation of Ab peptide
BConformational change in the prion protein (PrP)
CDopamine deficiency
DExpansion of polyglutamine repeats
Pathology
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