KMU Past Paper Practice

Question:

A 38-year-old woman has a firm, palpable skin lesion extending well into the dermis. It is deeper than a papule and produces a rounded elevation of the skin surface. Which morphological term best describes this lesion?

Options:

Correct Answer: Nodule

Explanation: A nodule is a solid, palpable lesion that extends deeper into the dermis or subcutaneous tissue than a papule.

Question:

A patient develops several small elevated lesions containing cloudy yellow-white material. Microscopic examination shows abundant inflammatory cells and cellular debris within the cavity. Which lesion type is being described?

Options:

Correct Answer: Pustule

Explanation: A pustule is an elevated lesion filled with purulent material composed mainly of inflammatory cells and debris.

Question:

A 29-year-old man with a chronic inflammatory skin disorder notices dry, thin flakes repeatedly shedding from the surface of several lesions. Which epidermal material forms this visible surface change?

Options:

Correct Answer: Epidermal keratin

Explanation: Scale consists of visible flakes of keratin produced by abnormal or accelerated shedding of the stratum corneum.

Question:

A patient with severe pruritus has multiple linear superficial areas where the epidermis has been removed by fingernails. Which term most accurately describes these lesions?

Options:

Correct Answer: Excoriation

Explanation: Excoriations are superficial epidermal defects caused by scratching or other mechanical trauma.

Question:

Histological examination of a skin biopsy shows individual keratinocytes undergoing abnormal premature keratinization within the epidermis. Which pathological term best describes this change?

Options:

Correct Answer: Dyskeratosis

Explanation: Dyskeratosis refers to abnormal or premature keratinization of individual epidermal cells.

Question:

A broad raised lesion on the trunk appears to have developed by enlargement and coalescence of several smaller solid elevations. Which sequence best describes this morphological progression?

Options:

Correct Answer: Papules forming a plaque

Explanation: A plaque is a broad, raised, relatively flat-topped lesion and may develop through enlargement or coalescence of papules.

Question:

A medical student describes two fluid-filled lesions on a patient. One is small and the other is substantially larger, but both contain clear fluid. Which terminology is most appropriate for the larger lesion?

Options:

Correct Answer: Bulla

Explanation: Vesicle and bulla are both fluid-filled lesions; bulla is the term used for the larger blistering lesion.

Question:

A patient presents during the early phase of an eczematous eruption. The affected skin is erythematous, intensely pruritic and covered by tiny lesions that have ruptured, leaving a moist surface. Which additional gross change is most likely to develop from drying of this exudate?

Options:

Correct Answer: Crusting

Explanation: Acute eczematous vesicles may rupture and ooze; drying of the surface exudate produces crusting.

Question:

A woman develops an eczematous eruption after repeated use of a cosmetic product. The clinician wants to determine whether the reaction is allergic rather than directly irritant. Which history would provide the strongest support for an allergic mechanism?

Options:

Correct Answer: Similar reaction followed previous exposure to the product

Explanation: Allergic contact dermatitis depends on sensitization; a previous exposure followed by a reproducible reaction supports this mechanism.

Question:

A child with recurrent dermatitis has dry skin and repeated inflammatory flares. The physician explains that one major abnormality allows greater water loss and easier penetration of environmental irritants through the skin. Which defect best accounts for this susceptibility?

Options:

Correct Answer: Impaired epidermal barrier function

Explanation: Atopic dermatitis involves defective epidermal barrier function, promoting water loss and penetration of irritants and environmental antigens.

Question:

A patient with an eczematous disorder repeatedly scratches the affected skin because of severe itching. This worsens epidermal barrier damage, which in turn promotes further inflammation and itching. Which concept best describes this self-perpetuating process?

Options:

Correct Answer: Itch-scratch cycle

Explanation: In atopic dermatitis, itching promotes scratching, which further damages the barrier and drives additional inflammation and pruritus.

Question:

A 23-year-old man develops an acute symmetrical eruption several days after an infectious illness. The lesions evolve from erythematous papules into concentric lesions and are predominantly distributed on the distal limbs. Which distribution pattern most supports the suspected diagnosis?

Options:

Correct Answer: Symmetrical extremity involvement

Explanation: Erythema multiforme commonly produces an acute, symmetrical eruption on the extremities, with lesions that evolve into concentric target forms.

Question:

A patient with an acute eruption has concentric skin lesions on both hands and forearms. Several lesions also involve the oral mucosa. Which interpretation of the mucosal findings is most appropriate?

Options:

Correct Answer: They may occur in more significant erythema multiforme

Explanation: Mucosal involvement can accompany erythema multiforme, particularly when the inflammatory reaction is more significant.

Question:

A 40-year-old patient has a chronic inflammatory dermatosis involving the elbows, knees and scalp. A biopsy shows neutrophils collecting within the superficial epidermis and stratum corneum. Which diagnosis best integrates the clinical distribution and microscopic finding?

Options:

Correct Answer: Psoriasis

Explanation: Psoriasis characteristically affects extensor surfaces and scalp; superficial epidermal neutrophil collections may accompany its hyperproliferative morphology.

Question:

A skin biopsy from a chronic inflammatory plaque shows regular downward elongation of epidermal rete ridges. Which gross property of the lesion is most directly related to this epidermal hyperplasia?

Options:

Correct Answer: Raised plaque formation

Explanation: Epidermal hyperplasia and elongated rete ridges increase epidermal thickness, contributing to the raised plaque morphology of psoriasis.

Question:

A middle-aged woman presents with recurrent oral erosions and skin blisters. Histological examination demonstrates an intraepidermal cleft. Which additional clinical feature would be most consistent with the same level of epidermal injury?

Options:

Correct Answer: Erosions from easily disrupted blisters

Explanation: In pemphigus, superficial intraepidermal cleavage produces fragile lesions that rupture readily, so erosions may be more obvious than intact blisters.

Question:

A 67-year-old man develops an autoimmune blistering disorder. Biopsy shows intact epidermal keratinocyte cohesion, but the epidermis has detached as a sheet from the underlying dermis. Which structural target is functionally disrupted?

Options:

Correct Answer: Attachment between epidermis and basement membrane zone

Explanation: Bullous pemphigoid disrupts structures that anchor the epidermis to the basement membrane zone, producing subepidermal separation.

Question:

A teenager develops several benign rough growths on the hands. Histology demonstrates epidermal thickening with finger-like surface projections and increased keratin. Which etiological factor best accounts for these lesions?

Options:

Correct Answer: Human papillomavirus

Explanation: Warts are benign epidermal proliferations caused by HPV and characteristically show hyperkeratosis, acanthosis and papillomatosis.

Question:

A 9-year-old girl is evaluated for gradually progressive weakness. Examination confirms symmetrical proximal muscle weakness and characteristic inflammatory skin changes. Which additional investigation would provide direct structural evidence of inflammatory muscle injury when diagnostic confirmation is required?

Options:

Correct Answer: Muscle biopsy

Explanation: Muscle biopsy can directly demonstrate inflammatory muscle injury and may support diagnostic confirmation of juvenile dermatomyositis.

Question:

A 12-year-old child has chronic proximal weakness. The physician is considering juvenile dermatomyositis and a primary muscular dystrophy. Which clinical observation would provide the strongest evidence that an inflammatory dermatomologic myopathy is present?

Options:

Correct Answer: Violaceous periorbital eruption

Explanation: A heliotrope-type periorbital eruption provides a characteristic cutaneous clue that distinguishes juvenile dermatomyositis from primary muscular dystrophy.