## Histological Patterns of Basal Cell Carcinoma **Key Point:** The nodular variant of BCC has the most favorable prognosis with the lowest recurrence rate and best clinical outcomes. ### Comparison of BCC Subtypes by Prognosis | Pattern | Recurrence Rate | Prognosis | Depth of Invasion | |---------|-----------------|-----------|-------------------| | **Nodular** | 5–10% | Best | Superficial to mid-dermis | | **Superficial** | 5–15% | Good | Epidermis and superficial dermis | | **Micronodular** | 15–20% | Intermediate | Mid to deep dermis | | **Infiltrative** | 20–30% | Poor | Deep dermal invasion | | **Basosquamous** | 25–40% | Worst | Aggressive, deep invasion | **High-Yield:** Nodular BCC accounts for ~80% of all BCCs and is the most common type encountered clinically. Its well-demarcated borders and superficial-to-mid dermal location make it easier to treat completely with standard excision or curettage and cautery. **Clinical Pearl:** Infiltrative and basosquamous variants show perineural invasion and deeper dermal involvement, leading to higher recurrence rates (20–40%) and require more aggressive treatment (Mohs micrographic surgery preferred). **Mnemonic:** **SIMB** (Superficial, Infiltrative, Micronodular, Basosquamous) in order of increasing aggressiveness — **N**odular sits between Superficial and Micronodular in terms of behavior. ### Why Nodular is Best 1. Clear tumor-stroma interface 2. Limited perineural invasion 3. Responds well to standard surgical and non-surgical therapies 4. Metastasis is exceptionally rare (< 0.1%) 
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