Skin Tumors — MCQs

Skin Tumors Indian Medical PG Practice Questions and MCQs

Question 181: Oral melanomas are much more aggressive than cutaneous melanomas. At what stage is the diagnosis typically made?

A. Stage 2
B. Stage 3 (Correct Answer)
C. Stage 4
D. Stage 5

Explanation: **Explanation:** **1. Why Stage 3 is Correct:** Oral mucosal melanoma is a rare but highly aggressive neoplasm. Unlike cutaneous melanoma, which uses the TNM staging system starting from Stage 0/I, the **AJCC (American Joint Committee on Cancer) staging for mucosal melanoma of the head and neck begins at Stage III.** Because mucosal melanomas are inherently aggressive and associated with a poor prognosis regardless of tumor thickness, there are no Stage I or II classifications. Even a localized tumor with no nodal involvement (T3 N0 M0) is automatically classified as **Stage III**. This reflects the biological "head start" these tumors have compared to their cutaneous counterparts. **2. Why Other Options are Incorrect:** * **Stage 2 (Option A):** This stage does not exist in the AJCC staging system for mucosal melanomas. All localized diseases are "upstaged" to Stage III. * **Stage 4 (Option B):** Stage IV is reserved for advanced disease involving regional lymph node metastasis (Stage IVA/B) or distant metastasis (Stage IVC). While many patients are diagnosed late, Stage III is the earliest possible clinical stage at diagnosis. * **Stage 5 (Option D):** There is no Stage 5 in the AJCC TNM staging system for any melanoma. **3. Clinical Pearls for NEET-PG:** * **Most Common Site:** The hard palate and maxillary gingiva are the most frequent sites for oral melanoma. * **ABCDE Rule:** Often does not apply well to oral lesions; look for the "BANS" area (Back, Arm, Neck, Scalp) in cutaneous cases, but in the mouth, look for **pigmented patches with irregular borders.** * **Prognosis:** Much worse than cutaneous melanoma (5-year survival is only 10–25%). * **Staging Rule:** Remember: **Mucosal Melanoma = No Stage I or II.** It starts at III.

Question 182: What is the treatment for mycosis fungoides syndrome?

A. 5-Fluorouracil
B. Doxorubicin
C. Electron beam therapy (Correct Answer)
D. Interferon

Explanation: **Explanation:** **Mycosis Fungoides (MF)** is the most common type of Cutaneous T-Cell Lymphoma (CTCL). It is characterized by the malignant proliferation of skin-homing CD4+ T-cells. **Why Electron Beam Therapy is Correct:** Total Skin Electron Beam Therapy (TSEBT) is a highly effective treatment for MF because electrons have a limited depth of penetration. Unlike X-rays, electrons deposit their energy primarily in the epidermis and dermis, sparing deeper internal organs. This makes it ideal for treating widespread cutaneous lesions (patches, plaques, or tumors) while minimizing systemic toxicity. It is often considered the gold standard for extensive skin involvement. **Analysis of Incorrect Options:** * **A. 5-Fluorouracil:** This is an antimetabolite used topically for actinic keratosis or superficial basal cell carcinomas, but it is not a standard treatment for MF. * **B. Doxorubicin:** While liposomal doxorubicin may be used in advanced, systemic, or refractory stages of MF, it is not the primary or characteristic treatment modality compared to skin-directed therapies. * **D. Interferon:** Interferon-alpha is an immunomodulatory systemic therapy used for MF, but it is typically a second-line agent or used in combination with other therapies like PUVA. **High-Yield Clinical Pearls for NEET-PG:** * **Staging:** MF progresses through three classic stages: **Patch → Plaque → Tumor**. * **Histology:** Look for **Pautrier’s microabscesses** (clusters of malignant T-cells in the epidermis) and "buttock cells" (cerebriform nuclei). * **Sézary Syndrome:** The leukemic triad of MF consisting of erythroderma, lymphadenopathy, and circulating atypical T-cells (Sézary cells). * **First-line for early stage:** Topical corticosteroids, PUVA (Photochemotherapy), or Narrowband UVB.

Question 183: What is the most common malignancy associated with ichthyosis?

A. Hodgkin's disease (Correct Answer)
B. Mycosis fungoides
C. Kaposi's sarcoma
D. Carcinoma breast

Explanation: **Explanation:** The question refers to **Acquired Ichthyosis**, a cutaneous marker of internal systemic disease. Unlike hereditary ichthyosis, which appears at birth or in early childhood, acquired ichthyosis develops in adulthood and is frequently a **paraneoplastic manifestation**. **1. Why Hodgkin’s Disease is Correct:** **Hodgkin’s Lymphoma (HD)** is the most common malignancy associated with acquired ichthyosis. The skin changes typically manifest as generalized dryness and fish-like scaling, often appearing before, during, or after the diagnosis of the lymphoma. The severity of the ichthyosis often correlates with the activity of the underlying malignancy. **2. Analysis of Incorrect Options:** * **Mycosis Fungoides (MF):** While MF is a cutaneous T-cell lymphoma that can present with "ichthyosiform" lesions (Ichthyosiform Mycosis Fungoides), it is not the most common systemic malignancy associated with the sudden onset of acquired ichthyosis. * **Kaposi’s Sarcoma:** This is a vascular tumor associated with HHV-8 and HIV/AIDS. It does not typically present with ichthyosis as a paraneoplastic feature. * **Carcinoma Breast:** While solid tumors (lung, breast, colon) can occasionally cause acquired ichthyosis, they are statistically less common triggers compared to lymphoproliferative disorders, specifically Hodgkin’s disease. **Clinical Pearls for NEET-PG:** * **Acquired Ichthyosis:** If a middle-aged or elderly patient presents with a sudden onset of ichthyosis without a family history, the first step is to screen for occult malignancy (most commonly **Hodgkin’s Lymphoma**). * **Other Associations:** Apart from malignancy, acquired ichthyosis can be seen in **HIV infection**, hypothyroidism, sarcoidosis, and as a side effect of drugs like nicotinic acid or clofazimine. * **Triad to remember:** Sudden onset ichthyosis + Pruritus + Lymphadenopathy = High suspicion for Hodgkin’s Disease.

Question 184: Which of the following is also known as calcifying epithelioma?

A. Dermatofibroma
B. Adenoma sebaceum
C. Pyogenic granuloma
D. None of the above (Correct Answer)

Explanation: **Explanation:** The correct answer is **None of the above** because **Calcifying Epithelioma of Malherbe** is the historical name for a **Pilomatricoma**. **1. Why the correct answer is right:** A Pilomatricoma is a benign tumor derived from the hair follicle matrix. It was originally named "calcifying epithelioma" by Malherbe and Chenantais in 1880, who mistakenly believed it originated from sebaceous glands. It typically presents as a firm, solitary, skin-colored or bluish nodule, most commonly on the face, neck, or upper extremities of children and young adults. **2. Why the other options are incorrect:** * **Dermatofibroma:** Also known as Benign Fibrous Histiocytoma, this is a common dermal nodule characterized by the "dimple sign" (tethering of the skin on lateral pressure). * **Adenoma Sebaceum:** This is a misnomer for **Angiofibromas** seen in Tuberous Sclerosis. They are not true adenomas of sebaceous glands but rather hamartomatous proliferations of fibrous tissue and blood vessels. * **Pyogenic Granuloma:** Also known as Lobular Capillary Hemangioma, this is a rapidly growing, friable vascular proliferation often triggered by minor trauma or pregnancy. **3. High-Yield Clinical Pearls for NEET-PG:** * **Histology of Pilomatricoma:** Characterized by a dual population of cells: **Basaloid cells** (at the periphery) and **Ghost cells/Shadow cells** (center), which are necrotic cells that have lost their nuclei but retained their cellular outlines. * **Calcification:** Occurs in approximately 75-80% of cases, giving it a stony-hard consistency. * **Genetics:** Frequently associated with mutations in the **CTNNB1 gene** (encoding beta-catenin). * **Multiple Pilomatricomas:** If present, consider an association with **Myotonic Dystrophy** or Gardner Syndrome.

Question 185: Koenen's tumor is associated with which of the following conditions?

A. Tuberous sclerosis (Correct Answer)
B. Neurofibromatosis
C. Psoriasis
D. Alopecia areata

Explanation: **Explanation:** **Koenen’s tumor**, also known as **periungual fibroma**, is a pathognomonic cutaneous marker for **Tuberous Sclerosis Complex (TSC)**. These are flesh-colored or reddish, elongated, firm papules or nodules that arise from the nail fold (periungual) or under the nail bed (subungual). They typically appear during adolescence or early adulthood and are one of the major clinical criteria for the diagnosis of TSC. **Analysis of Options:** * **A. Tuberous Sclerosis (Correct):** TSC is an autosomal dominant neurocutaneous syndrome caused by mutations in *TSC1* (hamartin) or *TSC2* (tuberin) genes. Koenen’s tumors are classic hamartomatous growths associated with this condition. * **B. Neurofibromatosis:** While also a neurocutaneous syndrome, its hallmark skin findings include Café-au-lait macules, Lisch nodules, and neurofibromas (plexiform or cutaneous), not periungual fibromas. * **C. Psoriasis:** This is an inflammatory skin condition characterized by silvery scales and nail changes like pitting, oil spots, and onycholysis, but not fibromatous tumors. * **D. Alopecia Areata:** This is an autoimmune form of hair loss. Nail changes may include "geometric pitting" or trachyonychia (rough nails), but it is unrelated to Koenen’s tumor. **High-Yield Clinical Pearls for TSC (Vogt’s Triad):** 1. **Epilepsy** (Seizures) 2. **Mental Retardation** (Intellectual disability) 3. **Adenoma Sebaceum** (Facial angiofibromas – the most common skin finding) **Other Skin Markers:** * **Ash-leaf spots:** Hypopigmented macules (earliest sign, seen under Wood’s lamp). * **Shagreen patch:** Connective tissue nevus usually on the lower back. * **Confetti skin lesions:** Multiple tiny hypopigmented macules.

Question 186: What is the treatment of choice for mycosis fungoides in the tumor stage?

A. PUVA therapy
B. Chemotherapy (Correct Answer)
C. Electron beam therapy
D. Topical corticosteroids

Explanation: **Explanation:** Mycosis Fungoides (MF) is the most common type of Cutaneous T-Cell Lymphoma (CTCL). It typically progresses through three clinical stages: **Patch → Plaque → Tumor stage.** **Why Chemotherapy is the Correct Choice:** In the **Tumor stage (Stage IIB and beyond)**, the disease is no longer confined to the epidermis or superficial dermis. There is deep dermal infiltration, and the risk of extracutaneous involvement (lymph nodes and viscera) increases significantly. While skin-directed therapies are used in early stages, the tumor stage requires **systemic therapy**. Multi-agent chemotherapy (e.g., CHOP regimen) or systemic biological agents (like Brentuximab vedotin) are indicated to manage the systemic burden of the malignancy. **Analysis of Incorrect Options:** * **PUVA therapy (Option A):** This is a first-line treatment for the **Patch and early Plaque stages**. UV radiation cannot penetrate deep enough to reach the thick infiltrates of the tumor stage. * **Electron beam therapy (Option C):** Total Skin Electron Beam Therapy (TSEBT) is highly effective for generalized plaques and thin tumors, but it is often considered a "skin-directed" modality. For advanced tumor stages with systemic risk, systemic chemotherapy is prioritized. * **Topical corticosteroids (Option D):** These are reserved for very early, localized **Patch stage** disease to reduce inflammation and pruritus. **NEET-PG High-Yield Pearls:** * **Pautrier’s Microabscess:** Pathognomonic histological feature (clusters of atypical T-cells in the epidermis). * **Sezary Syndrome:** The leukemic triad of erythroderma, lymphadenopathy, and Sezary cells (>1000/mm³) in peripheral blood. * **Immunophenotype:** Most cases are CD4+ (Helper T-cells). * **Treatment Mantra:** Early stage = Skin-directed (PUVA/Steroids); Late stage = Systemic (Chemo/Retinoids/Interferon).

Question 187: Oculocutaneous albinism is associated with which of the following malignancies?

A. Squamous cell carcinoma
B. Basal cell carcinoma
C. Melanoma
D. All of the above (Correct Answer)

Explanation: **Explanation:** Oculocutaneous Albinism (OCA) is a group of genetic disorders characterized by a deficiency in melanin synthesis. Melanin serves as the body’s primary photoprotective barrier against ultraviolet (UV) radiation. In its absence, the skin is highly susceptible to UV-induced DNA damage, leading to a significantly increased risk of various cutaneous malignancies. **Why "All of the above" is correct:** 1. **Squamous Cell Carcinoma (SCC):** This is the **most common** skin cancer in patients with OCA. Due to the lack of protective melanin, chronic sun exposure leads to actinic keratosis and subsequent aggressive SCCs, often occurring at a much younger age than in the general population. 2. **Basal Cell Carcinoma (BCC):** This is the second most common malignancy in OCA. Like SCC, it occurs on sun-exposed areas (head and neck) due to cumulative UV damage. 3. **Melanoma:** While melanocytes are present in OCA (unlike in vitiligo), they are amelanotic (pigment-deficient). Patients are at an increased risk for melanoma, which often presents as **amelanotic melanoma** (pink or red nodules), making clinical diagnosis challenging. **Clinical Pearls for NEET-PG:** * **Most common malignancy in OCA:** Squamous Cell Carcinoma (Note: In the general population, BCC is more common, but in OCA, SCC predominates). * **Inheritance:** Most forms of OCA are Autosomal Recessive. * **Key Enzyme:** Tyrosinase deficiency is the most common cause (OCA Type 1). * **Prevention:** Strict photoprotection (sunscreen, clothing) and regular dermatological surveillance are the mainstays of management. * **Differential Diagnosis:** Do not confuse OCA with **Vitiligo** (acquired loss of melanocytes) or **Piebaldism** (congenital absence of melanocytes in specific patches).

Question 188: In Alibert-Bazin syndrome, the origin of the lymphoma is from which cell type?

A. Eosinophil
B. B lymphocyte
C. Monocyte
D. T lymphocyte (Correct Answer)

Explanation: **Explanation:** **Alibert-Bazin syndrome** is the classic, most common form of **Mycosis Fungoides (MF)**. MF is the most frequent type of **Cutaneous T-Cell Lymphoma (CTCL)**. 1. **Why the correct answer is right:** The neoplastic cells in Alibert-Bazin syndrome are malignant **CD4+ T lymphocytes** (helper T cells). These cells are "skin-homing" because they express Cutaneous Lymphocyte Antigen (CLA). The disease typically progresses through three clinical stages: Patch, Plaque, and Tumor. The hallmark histological feature is the presence of **Pautrier’s microabscesses**, which are intraepidermal clusters of these malignant T cells. 2. **Why the incorrect options are wrong:** * **B lymphocyte:** While B-cell lymphomas can occur in the skin (e.g., Primary Cutaneous Marginal Zone Lymphoma), Alibert-Bazin syndrome is specifically a T-cell malignancy. * **Eosinophil:** Eosinophils may be seen in the inflammatory infiltrate of various skin diseases, but they are myeloid cells and do not undergo malignant transformation in MF. * **Monocyte:** Monocytes are precursors to macrophages and dendritic cells. While they play a role in the immune environment, they are not the cell of origin for this lymphoma. **High-Yield Clinical Pearls for NEET-PG:** * **Sezary Syndrome:** The leukemic variant of CTCL characterized by the triad of erythroderma, lymphadenopathy, and atypical circulating T cells (**Sezary cells** with "cerebriform" nuclei). * **Histology:** Look for **Pautrier’s microabscesses** and **Lutzner cells** (atypical T cells with indented nuclei). * **Treatment:** Early stages are treated with skin-directed therapies (PUVA, topical steroids, nitrogen mustard); advanced stages may require systemic chemotherapy or Brentuximab vedotin (anti-CD30).

Question 189: What is the most common presentation of blue rubber bleb nevus syndrome?

A. Asymptomatic iron deficiency anemia (Correct Answer)
B. Cardiac conduction defects
C. Renal aminoaciduria
D. Painful peripheral neuropathy

Explanation: **Blue Rubber Bleb Nevus Syndrome (BRBNS)**, also known as Bean Syndrome, is a rare neurocutaneous disorder characterized by multifocal venous malformations primarily affecting the skin and the gastrointestinal (GI) tract. ### **Explanation of the Correct Answer** The hallmark of BRBNS is the presence of "rubber bleb" vascular lesions in the GI tract (most commonly the small intestine). These lesions are prone to chronic, slow, and occult bleeding. Because the bleeding is often low-grade and intermittent, patients typically do not present with acute hematemesis or melena. Instead, they develop **chronic iron deficiency anemia (IDA)**, which is often asymptomatic until hemoglobin levels drop significantly. This makes IDA the most common and characteristic clinical presentation. ### **Why Other Options are Incorrect** * **B. Cardiac conduction defects:** While some phakomatoses (like Tuberous Sclerosis) are associated with cardiac rhabdomyomas, BRBNS does not typically involve the cardiac conduction system. * **C. Renal aminoaciduria:** This is a feature of Lowe Syndrome (Oculocerebrorenal syndrome), not BRBNS. Renal involvement in BRBNS is rare and usually limited to hematuria from bladder hemangiomas. * **D. Painful peripheral neuropathy:** Although some skin lesions in BRBNS can be tender or painful, the syndrome does not characteristically cause peripheral neuropathy. ### **NEET-PG High-Yield Pearls** * **Skin Lesions:** Three types are seen: (1) Blue "rubber bleb" nipples that are easily compressible and refill (most characteristic), (2) Large disfiguring cavernous angiomas, and (3) Blue-black punctate macules. * **Nocturnal Pain:** Skin lesions may occasionally be painful, often worsening at night. * **Inheritance:** Most cases are sporadic, but autosomal dominant inheritance (TEK gene mutation) has been reported. * **Diagnosis:** Endoscopy or capsule endoscopy is the gold standard to visualize GI lesions. * **Treatment:** Conservative (iron supplementation) for mild cases; endoscopic sclerotherapy or surgery for severe bleeding.

Question 190: Which of the following types of malignancy is associated with Marjolin's ulcer?

A. Basal cell carcinoma
B. Squamous cell carcinoma (Correct Answer)
C. Malignant fibrous histiocytoma
D. Neurotrophic malignant melanoma

Explanation: **Explanation:** **Marjolin’s ulcer** refers to a malignancy arising in a setting of chronic inflammation, long-standing scars, or non-healing wounds. **Why Squamous Cell Carcinoma (SCC) is correct:** The vast majority (approximately 75–90%) of malignancies arising from chronic scars are **Squamous Cell Carcinomas**. The underlying pathophysiology involves constant tissue irritation and chronic repair processes in areas with poor lymphatic drainage (like old burn scars or chronic osteomyelitis sinuses), which eventually leads to malignant transformation of the keratinocytes. **Why other options are incorrect:** * **Basal Cell Carcinoma (BCC):** While BCC is the most common skin cancer overall, it is much less frequent than SCC in the context of a Marjolin’s ulcer. * **Malignant Fibrous Histiocytoma:** This is a soft tissue sarcoma. While sarcomas can rarely arise from scars, they do not represent the classic "ulcer" pathology associated with Marjolin’s. * **Neurotrophic Malignant Melanoma:** Melanomas rarely arise from chronic scars; they are typically associated with UV radiation or pre-existing nevi. **High-Yield NEET-PG Pearls:** * **Most common site:** Lower limbs (specifically over joints where scars frequently break down). * **Most common cause:** Post-burn scars (cicatrix). * **Latent period:** It typically takes 25–30 years for a scar to undergo malignant transformation. * **Clinical Feature:** A Marjolin’s ulcer is characterized by an everted edge, foul-smelling discharge, and a tendency to bleed on touch. * **Prognosis:** SCC in a Marjolin’s ulcer is generally **more aggressive** and has a higher rate of metastasis compared to UV-induced SCC.

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Benign Epithelial Tumors

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Premalignant Epidermal Tumors

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Basal Cell Carcinoma

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Squamous Cell Carcinoma

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Melanocytic Nevi

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Melanoma

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Merkel Cell Carcinoma

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Vascular Tumors and Malformations

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Cutaneous Lymphomas

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Soft Tissue Tumors

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Metastatic Skin Tumors

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Skin Cancer Prevention and Screening

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Skin Tumors — MCQs

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