Basal Cell Carcinoma vs Melanoma
Basal Cell Carcinoma and Melanoma are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Basal Cell Carcinoma vs Melanoma at a glance
- Basal Cell Carcinoma: Most common human cancer; slow-growing locally invasive tumor of basal keratinocytes driven by UV-induced PTCH/Hedgehog mutations.
- Melanoma: Malignancy of melanocytes; deadliest common skin cancer; early detection by ABCDE criteria saves lives.
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Side-by-side comparison
| Feature | Basal Cell Carcinoma | Melanoma |
|---|---|---|
| At a glance | Most common human cancer; slow-growing locally invasive tumor of basal keratinocytes driven by UV-induced PTCH/Hedgehog mutations. | Malignancy of melanocytes; deadliest common skin cancer; early detection by ABCDE criteria saves lives. |
| Classic presentation | Pearly translucent nodule with rolled border, telangiectasias, and central ulcer on a sun-exposed area of an older fair-skinned adult.; Often asymptomatic; patient notices 'pimple' or 'sore that won't heal' for months to years; Occasional bleeding with minor trauma; rarely painful unless ulcerated/infected; Nodular BCC (most common,… | ABCDE positive pigmented lesion + ugly duckling; for acral/subungual — Hutchinson sign (periungual pigment extension).; New or changing pigmented lesion (ABCDE criteria); Pruritus, bleeding, tenderness, ulceration (later signs); Most patient-detected — emphasize self-examination and 'ugly duckling' sign; ABCDE criteria: Asymmetry,… |
| Workup / key labs | Histopathologic confirmation of basaloid tumor cells in palisading nests with retraction artifact and myxoid stroma.; Tissue diagnosis required — skin biopsy (shave or punch); Histopathology subtype determines management (nodular, superficial, morpheaform/infiltrative, basosquamous, micronodular) | Histopathology + AJCC 8th edition staging based on Breslow depth, ulceration, mitotic rate (T), nodal status (N), distant metastases and LDH (M).; EXCISIONAL biopsy with 1-3 mm margins down to subcutaneous fat is the diagnostic standard (preserves architectural assessment for Breslow depth); Shave biopsy may transect deep margin and… |
| Imaging | CT/MRI only for advanced or recurrent tumors with suspected perineural invasion or deep tissue involvement; Routine imaging not indicated for typical primary BCC | Stage IA-IIA: typically no imaging if asymptomatic; Stage IIB-IIIA: consider chest X-ray, CT chest/abdomen/pelvis; brain MRI for stage IIIC+; PET/CT for stage IIIB and higher; brain MRI for stage III/IV; Sentinel lymph node biopsy considered for Breslow ≥0.8 mm or any thickness with ulceration or other high-risk features |
| First-line treatment | Surgical excision with 4 mm margins for low-risk primary BCC (cure rate ~95%); Mohs micrographic surgery (preferred for high-risk BCC): face (especially H-zone — central face, periocular, periauricular, perinasal), morpheaform/infiltrative subtypes, recurrent tumors, large tumors (>2 cm), positive margins after standard excision — cure… | Wide local excision based on Breslow depth (AAD/NCCN):; • In situ — 5-10 mm margins; • ≤1.0 mm — 1 cm margins; • 1.01-2.0 mm — 1-2 cm margins; • >2.0 mm — 2 cm margins; Sentinel lymph node biopsy for stages T1b (≥0.8 mm or ulcerated) through T4; Mohs micrographic surgery for lentigo maligna and selected facial/acral melanomas… |
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