What is the diagnosis
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squamous cell carcinoma skin ulcerated keratotic lesion abdomen
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Based on the clinical image and textbook evidence, here is the analysis:
Diagnosis: Squamous Cell Carcinoma (SCC) / Keratoacanthoma variant
Clinical Features in the Image
| Feature | Observation |
|---|---|
| Lesion morphology | Dome-shaped nodule with a central keratotic/keratin-filled crater |
| Borders | Raised, rolled/indurated edges with surrounding erythema |
| Surface | Central white-gray keratinous plug with focal hemorrhagic crust |
| Background skin | Multiple scattered pits, scarring, hyperpigmentation — suggesting chronic actinic/toxic skin damage (possibly arsenical keratoses) |
| Location | Lower abdomen/suprapubic area in an elderly male |
Differential Diagnosis
- Keratoacanthoma (KA) / Well-differentiated SCC (most likely)
- Classic crateriform morphology with a central keratin plug
- Textbooks describe it as "a round, dome-shaped mass with a central keratin-filled crater" (Pfenninger & Fowler's) and now considered a low-grade SCC rather than a benign entity (Wills Eye Manual; Goldman-Cecil Medicine)
- The rolled, indurated margins and hemorrhagic base fit SCC with central keratinization
- Invasive Cutaneous SCC
- Harrison's (22e) describes SCC as "an ulcerated erythematous nodule or superficial erosion on sun-exposed skin of the head, neck, trunk, and extremities"
- Firm, ulcerated mass with everted/rolled edges is the "gross appearance" of SCC (Mulholland & Greenfield's Surgery)
- Arsenical keratosis → SCC transformation (important consideration)
- The background skin shows diffuse pitting, scarring, and multiple keratotic papules — highly suggestive of arsenical keratoses
- Fitzpatrick's Dermatology explicitly notes: arsenic-related skin diseases include SCC, Bowen disease, and diffuse hyperpigmentation
- This is common in South/Southeast Asia (endemic arsenic in groundwater)
Recommended Workup
- Punch/excisional biopsy of the primary lesion (mandatory to differentiate KA from invasive SCC)
- Histopathology: look for keratin pearls, atypical squamous cells, depth of invasion
- Regional lymph node examination (SCC metastasizes to nodes)
- Arsenic exposure history (drinking water, occupational, Fowler's solution)
- Urine/nail arsenic levels if arsenical keratoses suspected
- If confirmed SCC: wide local excision with clear margins ± sentinel node biopsy
Bottom line: This lesion is a keratoacanthoma-type squamous cell carcinoma arising in a background of what appears to be arsenical keratoses. Biopsy is essential to confirm and stage. This should be managed urgently as an outpatient surgical/oncology referral.
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