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Image Number 2394 (Squamous cell carcinoma)


Diagnosis: Squamous cell carcinoma

Site: Chest

Sex: F

Age: 76


Description: Red, scaly plaque

Submitted by: Ted Rosen

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Differential Diagnosis


Elderly female who noted a "change" in a chest lesion. Examination disclosed a classic seborrheic keratosis on the anterior chest adjacent to a redder, scaly plaque. The differential diagnosis included irritation in a seb ker OR a collision tumor (two different tumors over-lapping). The brown area was, indeed, just a seb ker. But the red area (outlined with arrows) was a SCCA adjacent to and abutting on the seb ker.

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