Dermatological Procedures Practice Questions

Q: Micrographic excision is used for the management of which of the following?

Penile cancer. **Explanation:** **Mohs Micrographic Surgery (MMS)** is a specialized surgical technique used primarily for skin cancers. It involves the progressive removal of thin layers of cancer-containing tissue, which are then examined microscopically until only cancer-free tissue remains. This method ensures the **highest cure rate** while providing **maximal tissue conservation**. **Why Penile Cancer is Correct:** In the management of **Penile Squamous Cell Carcinoma (SCC)**, particularly for tumors involving the glans or distal shaft, Mohs Micrographic Surgery is an indicated treatment modality. Because the penis is a functionally and psychologically vital organ, MMS is preferred over traditional wide local excision or partial penectomy to preserve as much healthy tissue as possible without compromising oncological safety. **Why Other Options are Incorrect:** * **Testicular Cancer:** Managed primarily via radical inguinal orchiectomy followed by chemotherapy or radiation. Since the entire testis is removed, micrographic tissue-sparing is not applicable. * **Prostate Cancer:** Managed via radical prostatectomy, radiation, or hormonal therapy. The anatomy of the prostate does not allow for the layer-by-layer peripheral margin mapping used in MMS. **High-Yield Clinical Pearls for NEET-PG:** * **Indications for MMS:** Basal Cell Carcinoma (BCC) and Squamous Cell Carcinoma (SCC) in "high-risk" areas (the H-zone of the face, genitals, hands, and feet) or recurrent tumors. * **Gold Standard:** MMS is the gold standard for BCC, offering cure rates up to 99%. * **Key Advantage:** 100% of the surgical margins are examined, unlike the "bread-loafing" technique used in standard excision which examines <1%.

Q: Which of the following are correct for managing hypertrophic scars? 1. Silicone gel sheeting 2. Intralesional steroid injections 3. Vitamin A gel applications 4. Laser treatment Select the answer using the code given below.

1, 2 and 4. ***1, 2 and 4*** - **Silicone gel sheeting**, **intralesional steroid injections**, and **laser treatment** are all established and effective methods for managing hypertrophic scars. - Silicone gel helps to hydrate the scar, reduce collagen synthesis, and decrease itching, while steroids reduce inflammation and collagen production, and lasers can help to improve scar texture and color. *1, 3 and 4* - This option incorrectly includes **Vitamin A gel applications** as a primary treatment. While retinoids can have some skin benefits, they are not a first-line or well-established treatment for hypertrophic scars. - **Silicone gel sheeting** and **laser treatment** are indeed effective, but the inclusion of Vitamin A makes this option less accurate. *1, 2 and 3* - This option also incorrectly includes **Vitamin A gel applications**. While **silicone gel sheeting** and **intralesional steroid injections** are effective, Vitamin A is not a standard treatment for hypertrophic scars. - The primary methods for managing hypertrophic scars focus on reducing collagen production and inflammation, which Vitamin A gel does not effectively address in this context. *2, 3 and 4* - This option correctly includes **intralesional steroid injections** and **laser treatment**, but it again incorrectly includes **Vitamin A gel applications** and omits **silicone gel sheeting**, which is a widely recommended and often first-line treatment. - Omitting **silicone gel sheeting** significantly weakens the effectiveness of this combination as a comprehensive management strategy.

Q: Chemical peeling is indicated in all of the following except

Lichen planus. ***Lichen planus*** - Chemical peels are generally **contraindicated** in active inflammatory conditions like **lichen planus**, as they can worsen the inflammation or trigger a Koebner phenomenon. - While chemical peels can address post-inflammatory hyperpigmentation, they should not be used during the active phase of lichen planus due to the risk of exacerbation. *Melasma* - **Melasma** is a common indication for chemical peels, particularly superficial and medium-depth peels, to reduce hyperpigmentation. - Peels containing agents like **glycolic acid**, salicylic acid, or trichloroacetic acid are often used to lighten melanin deposits. *Acne vulgaris* - Chemical peels are effective in treating **acne vulgaris** by exfoliating the skin, reducing comedones, and improving overall skin texture. - **Salicylic acid peels** are particularly useful due to their lipophilic nature, allowing them to penetrate and clean pores. *Photoaging* - **Photoaging**, characterized by fine lines, wrinkles, and dyspigmentation from sun exposure, is a primary indication for chemical peels. - Peels can promote **collagen remodeling** and help achieve a more even skin tone and smoother texture.

Q: Mohs micrographic excision for basal cell carcinoma is used for all the following Except

Superficial basal cell carcinoma on the trunk. ***Superficial basal cell carcinoma on the trunk*** - **Mohs micrographic surgery** is generally reserved for basal cell carcinomas (BCCs) in cosmetically and functionally sensitive areas, larger tumors, or those with aggressive features. - For **superficial BCCs** on the trunk, which is considered a low-risk area, standard excision, electrodessication and curettage, or topical therapies are often sufficient and preferred due to their less invasive nature and similar efficacy for this specific tumor type. *Tumors with perineural invasion* - **Perineural invasion** indicates a higher risk of recurrence and metastasis, making Mohs surgery an appropriate choice for complete tumor removal and margin control. - The precise, margin-controlled excision of Mohs helps ensure that all microscopic extensions along nerve sheaths are identified and removed. *Tumors with aggressive histology* - **Aggressive histologic subtypes** such as infiltrative, morpheaform, or micronodular BCCs have a higher risk of subclinical extension and recurrence. - Mohs surgery is highly effective for these types as it meticulously examines 100% of the surgical margins, maximizing tumor eradication while preserving healthy tissue. *Recurrent tumour* - **Recurrent BCCs** often have ill-defined borders and can grow more aggressively due to previous treatment altering the tissue architecture, making complete removal challenging. - Mohs surgery offers the highest cure rates for recurrent BCCs by precisely mapping and excising the tumor while preserving surrounding healthy tissue.

Q: Which of the following are side effects of using argon laser?

All of the options. ***All of the options*** - **Argon laser** targets hemoglobin and melanin, making it effective for vascular lesions but also carries a risk of pigmentary changes, scar formation, and local tissue reactions. - **Hypopigmentation**, **crusting**, and **keloid formation** are all recognized potential side effects due to its thermal destructive mechanism. *Hypopigmentation* - This side effect occurs due to the **non-selective absorption** of argon laser energy by **melanin** in the epidermis, leading to destruction of melanocytes. - It results in lighter patches of skin in the treated area, especially problematic in darker skin types. *Crusting* - **Crusting** is a common immediate post-treatment effect following argon laser therapy, caused by tissue damage and subsequent inflammation and exudation. - It indicates surface epithelial damage and typically resolves as the skin heals, but proper wound care is essential to prevent infection. *Keloid formation* - **Keloid formation** is a risk with argon laser treatment, particularly in individuals prone to abnormal scarring. - The thermal injury caused by the laser can trigger an exaggerated wound healing response, leading to raised, fibrous scars that extend beyond the original treated area.

Q: What is the best method to treat a large port-wine stain?

Pulsed dye laser. ***Pulsed dye laser*** - The **pulsed dye laser (PDL)** is considered the **gold standard** for treating port-wine stains due to its specific targeting of hemoglobin in the dilated capillaries without damaging surrounding tissue. - This treatment involves multiple sessions to progressively lighten the stain and prevent complications such as **nodularity** and **tissue hypertrophy**. *Radiotherapy* - **Radiotherapy** is generally not recommended for port-wine stains due to its potential for **scarring**, **pigment changes**, and risk of **malignancy**. - It is an aggressive treatment typically reserved for **cancerous conditions** or severe proliferative vascular lesions not amenable to other treatments. *Tattooing* - **Tattooing** involves injecting skin-colored pigments into the lesion to camouflage it, but it does not treat the underlying vascular abnormality. - This method can result in an **artificial appearance**, **uneven coverage**, and potential for **allergic reactions** or infections. *Excision with skin grafting* - **Surgical excision** of a large port-wine stain would result in a **significant scar** and require **skin grafting**, which carries risks of graft failure, poor aesthetic outcome, and color mismatch. - This method is generally reserved for very small, localized lesions or those with significant **nodular hypertrophy** that cannot be effectively managed by laser therapy.

Question 1

Micrographic excision is used for the management of which of the following?

Accepted Answer

Penile cancer

Answer

Testicular cancer

Answer

Prostate cancer

Answer

None of the above

Question 2

Which of the following are correct for managing hypertrophic scars?

1. Silicone gel sheeting
2. Intralesional steroid injections
3. Vitamin A gel applications
4. Laser treatment Select the answer using the code given below.

Accepted Answer

1, 2 and 4

Answer

1, 3 and 4

Answer

1, 2 and 3

Answer

2, 3 and 4

Question 3

Chemical peeling is indicated in all of the following except

Accepted Answer

Lichen planus

Answer

Melasma

Answer

Acne vulgaris

Answer

Photoaging

Question 4

Mohs micrographic excision for basal cell carcinoma is used for all the following Except

Accepted Answer

Superficial basal cell carcinoma on the trunk

Answer

Tumors with perineural invasion

Answer

Tumors with aggressive histology

Answer

Recurrent tumor

Question 5

Which of the following are side effects of using argon laser?

Accepted Answer

All of the options

Answer

Hypopigmentation

Answer

Crusting

Answer

Keloid formation

Question 6

What is the best method to treat a large port-wine stain?

Accepted Answer

Pulsed dye laser

Answer

Radiotherapy

Answer

Excision with skin grafting

Answer

Tattooing

Dermatological Procedures — MCQs

Dermatological Procedures — MCQs

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