Skin Tumors Practice Questions

Q: What is the most common clinicopathologic class of melanoma during the radial growth phase?

Superficial spreading. **Explanation:** **Superficial Spreading Melanoma (SSM)** is the most common clinicopathologic subtype of melanoma, accounting for approximately 70% of all cases. During its **radial growth phase**, the tumor cells spread laterally within the epidermis and superficial dermis. This phase can last for months to years before transitioning into the vertical growth phase (dermal invasion), making it the most frequently encountered type during early clinical evaluation. **Analysis of Options:** * **Superficial Spreading (Correct):** It typically presents as a variegated, pigmented plaque with irregular borders. It is most common on the backs of men and the lower limbs of women. * **Lentigo Maligna (Incorrect):** This subtype occurs on chronically sun-damaged skin (usually the face of elderly patients). While it has a very long radial growth phase (often decades), it is less common overall than SSM. * **Acral Lentiginous (Incorrect):** This is the most common subtype in dark-skinned individuals (Asians and African Americans), occurring on palms, soles, and subungual areas. However, globally and statistically, it is less common than the superficial spreading type. **High-Yield Clinical Pearls for NEET-PG:** * **Most common type overall:** Superficial Spreading Melanoma. * **Most common type in India/Dark skin:** Acral Lentiginous Melanoma. * **Best prognostic factor:** **Breslow’s Depth** (vertical thickness measured from the granular layer to the deepest tumor cell). * **ABCDE Criteria:** Asymmetry, Border irregularity, Color variegation, Diameter >6mm, and Evolving. * **Nodular Melanoma:** Notable for having **no** identifiable radial growth phase; it begins in the vertical growth phase, leading to a poorer prognosis.

Q: Basal cell carcinoma spreads primarily by which mechanism?

Direct spread. **Explanation:** Basal Cell Carcinoma (BCC) is the most common skin malignancy, arising from the non-keratinizing cells of the basal layer of the epidermis. **Why Direct Spread is Correct:** BCC is characterized by its **locally invasive** nature. It spreads primarily by **direct extension** (per continuitatem), infiltrating surrounding tissues, including dermis, fascia, muscle, and even bone if left untreated. This aggressive local behavior, despite a lack of distant spread, earned it the historical name "Rodent Ulcer," as it appears to "eat away" the local tissue. **Why Other Options are Incorrect:** * **Lymphatic and Haematogenous Spread:** These are extremely rare in BCC (occurring in less than 0.1% of cases). Metastasis is so infrequent that BCC is often described as a "locally malignant" tumor. In contrast, Squamous Cell Carcinoma (SCC) and Melanoma frequently utilize lymphatic and hematogenous routes. * **None of the above:** This is incorrect as direct spread is the well-established primary mechanism of progression. **NEET-PG High-Yield Pearls:** * **Most common site:** Face, specifically above the line joining the lobe of the ear to the angle of the mouth (inner canthus is a high-risk site). * **Risk Factor:** Chronic UV light exposure (UVB) is the primary trigger. * **Clinical Hallmark:** A pearly, translucent nodule with telangiectasia and a rolled-out edge. * **Treatment of Choice:** Surgical excision with negative margins. For high-risk areas (face), **Mohs Micrographic Surgery** is the gold standard to ensure margin clearance while preserving tissue. * **Prognosis:** Excellent, due to the very low metastatic potential.

Q: Which of the following conditions is depicted?

Plexiform neurofibroma. ***Plexiform neurofibroma*** - Characteristic **"bag of worms"** appearance with diffuse, infiltrating **soft tissue masses** along nerve distributions, pathognomonic for **NF1**. - Presents as **rope-like**, **tortuous subcutaneous masses** that feel like a collection of intertwined cords or worms under the skin. *Von Hippel Lindau syndrome* - Primarily characterized by **retinal hemangioblastomas** and **cerebellar hemangioblastomas**, not cutaneous neurofibromas. - Associated with **renal cell carcinomas** and **pheochromocytomas**, lacking the distinctive soft tissue masses seen in plexiform neurofibromas. *Marfan syndrome* - Features **arachnodactyly** (long, slender fingers), **lens dislocation**, and **aortic root dilatation**. - Does not present with **cutaneous masses** or the characteristic "bag of worms" appearance. *Tuberous sclerosis* - Characterized by **ash-leaf spots**, **shagreen patches**, and **facial angiofibromas** (adenoma sebaceum). - Lacks the **plexiform growth pattern** and infiltrating soft tissue masses typical of neurofibromas.

Q: Prognosis of malignant melanoma depends upon:

Invasion of nearby nodes. **Explanation:** The prognosis of malignant melanoma is primarily determined by the extent of disease spread and the depth of the primary lesion. **1. Why "Invasion of nearby nodes" is correct:** The most important prognostic factor for malignant melanoma is the **Stage of the disease** at the time of diagnosis. According to the AJCC (American Joint Committee on Cancer) staging, the presence of regional lymph node metastasis (Stage III) significantly decreases the 5-year survival rate compared to localized disease (Stage I or II). Once the tumor invades nearby nodes, it indicates a high potential for systemic dissemination, making it the strongest predictor of outcome among the given options. **2. Why other options are incorrect:** * **Grade of tumor:** Unlike many other cancers, "grading" (degree of differentiation) is not a standard prognostic tool for melanoma. Instead, **Breslow’s Thickness** (measured in mm) and **Clark’s Levels** (anatomical depth) are used. * **Age of the patient:** While older age can be associated with a poorer prognosis, it is a secondary factor and not as definitive as nodal status. * **Site of lesion:** While lesions on the trunk, head, or neck (BANS area: Back, Axilla, Neck, Scalp) generally have a worse prognosis than those on the extremities, the anatomical site is less critical than the stage and depth of the lesion. **High-Yield Clinical Pearls for NEET-PG:** * **Single most important prognostic factor overall:** Lymph node involvement (Stage). * **Most important prognostic factor for Stage I & II (Localized disease):** Breslow’s Thickness (Vertical depth). * **Breslow’s Thickness:** Measured from the granular layer of the epidermis to the deepest point of tumor invasion. * **ABCDE Criteria for diagnosis:** Asymmetry, Border irregularity, Color variation, Diameter >6mm, Evolving. * **Commonest site in Indians:** Palm and Soles (Acral Lentiginous Melanoma).

Q: Plexiform neurofibromatosis commonly affects which of the following nerves?

Trigeminal nerve. **Explanation:** **Plexiform neurofibromas** are pathognomonic for **Neurofibromatosis Type 1 (NF1)**. Unlike localized neurofibromas, these are congenital, diffuse, and involve multiple fascicles of a nerve, often described as a "bag of worms" on palpation. **Why Trigeminal Nerve is Correct:** While plexiform neurofibromas can involve any nerve, they have a strong predilection for the **Trigeminal nerve (Cranial Nerve V)**, particularly the **ophthalmic division (V1)**. Involvement of the V1 branch often leads to the classic clinical presentation of **S-shaped ptosis** of the upper eyelid. This is a high-yield association frequently tested in postgraduate exams. **Analysis of Incorrect Options:** * **Facial Nerve (A):** While the facial nerve can be compressed by tumors in the parotid or cerebellopontine angle (like vestibular schwannomas in NF2), it is not the primary site for plexiform neurofibromas. * **Peripheral Nerve (C):** Although plexiform neurofibromas *are* tumors of the peripheral nerves, the question asks which specific nerve is "commonly affected." The Trigeminal nerve is the most characteristic cranial nerve involved. * **Glossopharyngeal Nerve (D):** This nerve is rarely involved in NF1. **Clinical Pearls for NEET-PG:** * **Pathognomonic Sign:** Plexiform neurofibroma is one of the cardinal diagnostic criteria for NF1. * **Bag of Worms:** The classic physical exam finding. * **Malignant Transformation:** Unlike cutaneous neurofibromas, plexiform neurofibromas carry a 5-10% lifetime risk of transforming into **Malignant Peripheral Nerve Sheath Tumors (MPNST)**. * **Imaging:** MRI is the gold standard to assess the extent of the lesion.

Q: Which of the following is a slow-growing skin tumor that rarely metastasizes to lymph nodes?

Basal cell carcinoma. **Explanation:** **Basal Cell Carcinoma (BCC)** is the most common skin cancer globally. It is characterized by its **slow growth** and **locally invasive** nature. The defining clinical feature of BCC is its extremely low potential for lymphatic or distant metastasis (less than 0.1%). It arises from the non-keratinizing cells of the basal layer of the epidermis and typically presents as a pearly papule with telangiectasia, often on sun-exposed areas like the face. **Why the other options are incorrect:** * **Melanoma:** This is the most aggressive form of skin cancer. It has a high propensity for early lymphatic and hematogenous spread, making it the leading cause of skin cancer deaths. * **Squamous Cell Carcinoma (SCC):** While also sun-related, SCC grows faster than BCC and has a significant risk of metastasis (roughly 2–5%), especially when occurring on the lips, ears, or in chronic scars (Marjolin’s ulcer). * **Angiosarcoma:** This is a highly malignant, rapidly progressing vascular tumor. It is notorious for early metastasis and a poor prognosis. **Clinical Pearls for NEET-PG:** * **"Rodent Ulcer":** A clinical variant of BCC that causes extensive local tissue destruction if left untreated. * **Risk Factor:** Chronic UV exposure is the primary cause; however, BCC is also associated with **Gorlin Syndrome** (Basal Cell Nevus Syndrome). * **Histology:** Look for **"Peripheral Palisading"** of nuclei and **retraction artifacts** (clefts) between the tumor nests and the stroma. * **Location:** Most common above the line joining the tragus of the ear to the angle of the mouth.

Q: All of the following statements regarding actinic keratosis are true, EXCEPT:

Usually seen in young individuals. **Explanation:** Actinic Keratosis (AK), also known as solar keratosis, is a **premature skin lesion** caused by cumulative, long-term exposure to ultraviolet (UV) radiation. It is considered a **pre-malignant** condition that can progress to Squamous Cell Carcinoma (SCC). **Why Option D is the Correct Answer (The Exception):** Actinic keratosis is a disease of **older individuals** (typically >50 years). Because it results from the cumulative damage of UV radiation over decades, it is rarely seen in young individuals unless they have specific genetic predispositions to UV sensitivity (e.g., Xeroderma Pigmentosum). **Analysis of Other Options:** * **Option A:** AK is significantly more common in individuals with **Fair Skin (Fitzpatrick types I and II)** due to lower melanin protection against UV rays. * **Option B:** Immunosuppression is a major risk factor. **Organ transplant recipients** have a 250-fold increased risk of developing AKs and subsequent SCC due to long-term immunosuppressive therapy. * **Option C:** **Topical 5-Fluorouracil (5-FU)** is a gold-standard treatment for "field cancerization." It inhibits thymidylate synthase, targeting rapidly dividing dysplastic cells. Other treatments include Imiquimod, Diclofenac gel, and Cryotherapy. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Presentation:** "Sandpaper-like" texture on palpation; erythematous, scaly plaques on sun-exposed areas (scalp, face, ears). * **Histopathology:** Shows **parakeratosis** (retention of nuclei in the stratum corneum) and **dysplasia** of the basal layer of the epidermis. * **Cutaneous Horn:** A clinical shape AK can take; the base must be biopsied to rule out SCC. * **Spreading Pigmented Actinic Keratosis (SPAK):** A variant that mimics melanoma.

Question 1

Which type of melanoma is malignant?

Accepted Answer

Junctional nevus

Answer

Blue nevus

Answer

Intradermal nevus

Answer

None of the above

Question 2

What is the most common clinicopathologic class of melanoma during the radial growth phase?

Accepted Answer

Superficial spreading

Answer

Acral lentigines

Answer

Lentigo maligna

Answer

None of the above

Question 3

Basal cell carcinoma spreads primarily by which mechanism?

Accepted Answer

Direct spread

Answer

Lymphatics

Answer

Haematogenous

Answer

None of the above

Question 4

Which of the following conditions is depicted?

Accepted Answer

Plexiform neurofibroma

Answer

Von Hippel Lindau syndrome

Answer

Marfan syndrome

Answer

Tuberous sclerosis

Question 5

Prognosis of malignant melanoma depends upon:

Accepted Answer

Invasion of nearby nodes

Answer

Grade of tumour

Answer

Age of the patient

Answer

Site of lesion

Question 6

Plexiform neurofibromatosis commonly affects which of the following nerves?

Accepted Answer

Trigeminal nerve

Answer

Facial nerve

Answer

Peripheral nerve

Answer

Glossopharyngeal nerve

Question 7

Which of the following is a slow-growing skin tumor that rarely metastasizes to lymph nodes?

Accepted Answer

Basal cell carcinoma

Answer

Melanoma

Answer

Squamous cell carcinoma

Answer

Angiosarcoma

Question 8

Regarding malignant melanoma, all the following are true EXCEPT?

Accepted Answer

May show spontaneous regression.

Answer

Vertical depth of invasion is a prognostic indicator.

Answer

Occurs in actinic damaged skin.

Answer

Lentigo maligna is a type of malignant melanoma.

Question 9

A 50-year-old male presented with a characteristic lesion on the face for 5 years which is slowly increasing in size and bleeds whenever it is scratched. The patient has a history of chronic sun exposure, and there is no evidence of pain or itching over the lesion. Biopsy from the lesion is performed. Which of the following drugs are approved for the above condition?

Accepted Answer

5-FU, Imiquimod, and Vismodegib

Answer

5-FU, Itraconazole, and Vismodegib

Answer

Imiquimod, Itraconazole, and Azathioprine

Answer

5-FU, Imiquimod, Itraconazole, and Azathioprine

Question 10

All of the following statements regarding actinic keratosis are true, EXCEPT:

Accepted Answer

Usually seen in young individuals

Answer

Increased incidence in people with light skin

Answer

Increased incidence in organ transplant recipients

Answer

Topical 5-fluorouracil can be used in treating the disease

Skin Tumors — MCQs

Skin Tumors — MCQs

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