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Questions and Answers
What is the primary feature that characterizes all types of acanthosis nigricans?
In what percentage of cases is acanthosis nigricans associated with benign conditions?
Which of the following conditions is most commonly associated with acanthosis nigricans?
Which receptor tyrosine kinase is believed to stimulate the increased signaling leading to acanthosis nigricans in type 2 diabetes?
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During which life stages is acanthosis nigricans most commonly seen?
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What characterizes junctional nevi?
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What is a common feature of dysplastic nevi?
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What genetic mutations are often associated with the development of dysplastic nevi?
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Which of the following statements about melanoma is true?
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Which characteristic best describes dysplastic nevi?
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What is the relationship between UV radiation and melanoma?
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What are the potential clinical implications of dysplastic nevi?
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Which of the following best describes compound nevi?
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What characterizes a keloid scar?
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Which factor is NOT related to the severity of a thermal injury?
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What is a characteristic feature of full-thickness burns?
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What occurs during burn shock?
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Which type of mechanical trauma includes lacerations?
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What is a consequence of the fluid loss associated with burn injuries?
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Which type of burn affects the dermis and is characterized by pain?
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Among the following, which is considered the greatest threat to life in burn patients?
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What is the primary cause of epidermal injury in aureus infections?
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Which clinical manifestation is commonly associated with infections of Trichophyton rubrum?
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What is a common predisposing factor for Tinea cruris infection?
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Which type of tinea is characterized by asymptomatic, patchy skin lesions often associated with hair loss?
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How common is Tinea pedis among the general population?
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In Tinea pedis, what is primarily responsible for the inflammatory response?
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What are the presenting symptoms of Tinea faciei?
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What is the significance of desmoglein 1 in the epidermis?
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Which of the following is a characteristic feature of dermatofibrosarcoma protuberans?
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What is the typical size of dermatofibrosarcoma protuberans lesions?
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What sign is characterized by localized dermal edema and wheal formation when lesional skin is rubbed?
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In which age group is urticaria most commonly observed?
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What is the primary cause of urticaria?
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Which of the following is a systemic symptom related to mastocytosis?
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What is the appearance of cutaneous lesions in mastocytosis?
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What happens to urticarial lesions over time?
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What is the main type of cell involved in mast cell disease?
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What is a key feature of acute inflammatory dermatoses, specifically urticaria?
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What characterizes delayed primary closure in wound management?
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What type of ulcer primarily results from chronic venous hypertension?
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Which type of ulcer is especially painful and results from peripheral artery atherosclerosis?
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What defines primary closure in wound healing?
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What is a characteristic feature of hypertrophic scars?
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What is a significant environmental factor linked to sporadic melanoma cases?
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Which of the following is NOT one of the ABCDE warning signs of melanoma?
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What type of growth phase do melanoma tumors typically undergo as they progress?
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Which of the following accurately describes the borders of melanoma?
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Which genetic mutation is most frequently associated with melanoma?
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What is the primary characteristic of the lesions associated with psoriasis?
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Which areas of the body are most commonly affected by psoriasis?
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What role do CD4+ T-cells play in psoriasis?
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What is the significance of the Auspitz sign in psoriasis?
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What is a consequence of psoriasis that involves nail changes?
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What is the primary risk factor that can hasten the lowering of body temperature?
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At what body temperature does loss of consciousness typically occur?
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What type of hyperpigmentation is typical of freckles?
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How do lentigines differ from freckles with respect to sunlight exposure?
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What is a common feature of melanocytic nevi?
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Which of the following statements is true about freckles?
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What histologic feature characterizes lentigines?
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Which of the following describes the primary mechanism of injury induced by hypothermia?
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What is the primary cause of neonatal herpes infection?
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Which form of keratitis is associated with herpes simplex virus (HSV)?
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How does Varicella-Zoster Virus (VZV) primarily spread?
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What is a common symptom of exanthem subitum caused by HHV-6 and HHV-7?
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What risk factor increases the severity of VZV infections in individuals?
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What type of rash is typically associated with chickenpox caused by VZV?
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In what part of the body is latent Varicella-Zoster Virus most likely to be found?
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Which statement about genital herpes is true?
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Study Notes
Keloids
- Keloids are scar tissues that extend beyond the original wound area and do not regress.
- Formation is influenced by individual predisposition and is more prevalent in black populations.
Mechanical Trauma
- Traumatic injuries are caused by the shape and energy of the object impacting the tissue.
- Injury patterns include abrasions, contusions, lacerations, incised wounds, and puncture wounds.
Thermal Injury
- Severity of thermal injuries is determined by burn depth, body surface percentage affected, and inhalation of toxic fumes.
- 1st Degree Burns: Affect only the epidermis; redness and pain are common.
- 2nd Degree Burns: Involve the dermis, presenting with blisters and pain.
- 3rd Degree Burns: Extend to subcutaneous tissues; skin appears white, charred, dry, and painless.
- Burn shock occurs due to capillary leaks, fluid loss, and interstitial edema; severity dictates the rate and volume of fluid loss.
- Parkland formula is used for burn injury fluid resuscitation.
Dysplastic Nevi
- Dysplastic nevi can be precursors to melanoma, especially when numerous.
- Mutations in the NRAS and BRAF genes increase malignant transformation risks.
- Larger than typical nevi, can appear irregular or "pebbly," and show cytologic atypia.
- Clinical significance includes the potential for melanoma development.
Melanoma
- Melanoma is the most aggressive skin cancer but is highly treatable if detected early.
- Commonly arises in sun-exposed areas but can also originate from mucosal surfaces.
- Inherited susceptibility may account for 10-15% of cases, showcasing an autosomal dominant inheritance with variable penetrance.
- Strongly linked to UV radiation exposure.
Acanthosis Nigricans
- Characterized by thick, hyperpigmented skin resembling velvet, often in skin folds.
- Primarily associated with benign conditions; may occasionally indicate malignancies.
- Often seen in children or adolescents, can arise from obesity, endocrine disorders, or as part of congenital syndromes.
- Familial forms are linked to FGFR3 mutations and increased IGFR1 signaling.
- In middle-aged individuals, it may indicate gastrointestinal adenocarcinoma.
Dermatofibrosarcoma Protuberans
- A slow-growing primary fibrosarcoma of the skin; locally aggressive but rarely metastatic.
- Hallmarked by a translocation of COL1A1 and PDGFB genes.
- Often presents as a firm nodule on the trunk and may ulcerate.
Mastocytosis
- Involves increased mast cell numbers, primarily affecting children with urticaria pigmentosa being the most common form.
- Systemic forms can cause complications, including pruritus, flushing, and gastrointestinal symptoms.
- Characterized by Darier sign and dermatographism, responses triggered by localized skin stimuli.
Acute Inflammatory Dermatoses: Urticaria
- Urticaria, or hives, occurs due to localized mast cell degranulation, leading to edematous wheals.
- Episodes typically last under 24 hours and can reoccur.
- Often result from antigen-induced mast cell mediator release and can affect any skin area exposed to pressure.
Superficial Fungal Infections
- Caused by Trichophyton Rubrum with distinct types based on infection location:
- Tinea Capitis: Scalp infection, common in children, leads to scaling and hair loss.
- Tinea Corporis: Affects skin trunk; often appears as round, itchy plaques.
- Tinea Cruris: Groin infection prevalent among obese men in warm weather.
- Tinea Pedis (Athlete's Foot): Affects 30-40% of the population, often caused by superinfected bacterial reactions.
- Onychomycosis: Refers to nail infections arising from tinea, causing nail plate changes.
Tissue Healing and Ulcer Types
- TCG-β is a strong fibrogenic agent, impacting ECM deposition through a balance of fibrogenic agents, metalloproteinases (MMPs), and TIMPs.
- Primary closure involves closely opposing incision edges using sutures or staples for healing by primary intention.
- Secondary closure leaves the incision open, allowing healing through new tissue formation from the wound's base and sides, resulting in scarring.
- Delayed primary closure permits an open incision for several days to address infection and tissue viability before closure with sutures or grafts.
- Venous leg ulcers commonly affect the elderly, caused by chronic venous hypertension, leading to poor oxygen delivery and poor healing.
- Arterial ulcers are linked to atherosclerosis and diabetes, resulting in ischemia, painful necrotic lesions.
- Diabetic ulcers primarily affect the feet due to vascular disease, neuropathy, and infections, leading to extensive granulation tissue.
- Pressure sores result from prolonged tissue compression against bone, causing ulceration and necrosis.
- Hypertrophic scars result from excessive collagen deposition, characterized by rapid growth and eventual regression.
Hypothermia
- Body temperature at 90°F can cause loss of consciousness, bradycardia, and atrial fibrillation as core temperature drops.
- Hypothermia injuries arise from direct physical disruption in cells due to salt crystallization and indirect circulatory changes, leading to edema and hypoxia.
Disorders of Pigmentation and Melanocytes
- Freckles are small (1mm- several mm), tan-red or light brown macules that hyperpigment with sun exposure, characterized by no increase in melanocyte number but in melanin levels.
- Lentigo represents benign melanocyte hyperplasia, commonly seen in infants, presenting as oval, tan-brown macules, without darkening in sunlight.
- Melanocytic nevi are benign neoplasms often caused by mutations in the RAS signaling pathway, with variations in color and irregular borders being concerning features for melanoma.
- ABCDEs of melanoma serve as warning signs: Asymmetry, Borders (irregular), Color (variegated), Diameter (≥6 mm), and Evolution or change over time.
Psoriasis
- Chronic inflammatory autoimmune disorder driven by environmental and genetic factors, particularly HLA gene variants.
- Affects areas like elbows, knees, and scalp, characterized by well-demarcated, pink plaques with silver-white scales.
- Auspitz sign reflects bleeding points when the scaling is removed due to proximity of vessels in the dermal papillae.
- Associated with total body erythema (erythroderma) and specific nail changes affecting about 30% of patients.
Seborrheic Dermatitis
- An inflammation of the epidermis without a clearly defined cause, not exclusively linked to sebaceous glands.
Genital Herpes
- Caused primarily by HSV-2, presenting with vesicular lesions on genital mucous membranes, often turning into ulcers.
- Transmission to neonates during birth can lead to severe infection with generalized symptoms.
- Symptoms can include lymphadenopathy, splenomegaly, and necrotic foci in vital organs.
Varicella-Zoster Virus (VZV) Infections
- VZV causes chickenpox in acute infections and shingles upon reactivation.
- Notable for mild symptoms in children but severe cases in adults and immunocompromised individuals.
- VZV evades immunity to establish latent infections in sensory ganglia and spreads through respiratory droplets and hematogenous routes.
- Chickenpox rash appears about two weeks post-respiratory infection, presenting with widespread vesicular lesions.
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Description
This quiz explores the concepts of keloid formation and mechanical trauma. It covers the characteristics of keloids, including their tendency not to regress and their prevalence in specific populations. Additionally, it delves into the nature of mechanical injuries, highlighting how they vary based on the shape of the colliding object and the energy involved.