## Most Common Histological Subtype of Basal Cell Carcinoma **Key Point:** Nodular BCC is the most common histological variant, accounting for 60–80% of all basal cell carcinomas. ### Histological Subtypes and Frequency | Subtype | Frequency | Key Features | Prognosis | | --- | --- | --- | --- | | Nodular | 60–80% | Well-circumscribed nodules; pearly appearance; telangiectasia; central ulceration | Excellent; low recurrence | | Superficial | 15–25% | Multiple thin nests in dermis; erythematous patches; slow growth | Good; higher recurrence if undertreated | | Infiltrative | 5–10% | Ill-defined borders; aggressive growth; perineural invasion | Poor; higher recurrence; requires wider margins | | Basosquamous | 1–3% | Mixed basal and squamous differentiation; aggressive behavior | Poor; highest recurrence; may metastasize | **High-Yield:** Nodular BCC presents classically with: - Pearly, translucent nodule - Rolled or raised borders - Central ulceration ("rodent ulcer") - Telangiectatic vessels visible on dermoscopy ### Clinical Correlation The patient's presentation (pearly nodule with rolled edges and central ulceration) is the classic description of **nodular BCC**, which aligns with its high frequency. **Clinical Pearl:** Nodular BCC, despite being the most common, has the best prognosis because it is well-defined, non-aggressive, and rarely metastasizes. Recurrence rates are <5% with appropriate surgical excision. **Mnemonic:** SNIB = Superficial, Nodular, Infiltrative, Basosquamous (in order of frequency, roughly). ### Why Nodular is Most Common Nodular BCC arises from the interfollicular epidermis and represents the most differentiated form of BCC. It grows slowly and is often detected early due to its visible, cosmetically concerning appearance, making it the most frequently diagnosed subtype.
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