Incidental Finding of Benign Trichilemmal Cysts on 99mTc-Octreotide Scan

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A 63-year-old woman with neuroendocrine carcinoma of the colon was referred to our department for staging with 99mTc-octreotide scan. Two focal, highly intense, superficial lesions were detected in patient's scalp and paralumbar region, medial to the right kidney. Pathology correlation was recommended, revealing them both to be benign trichilemmal cysts. This unexpected finding strengthens the hypothesis of Merkel cell carcinoma and trichilemmal cysts originating from pluripotent stem cells of adnexal epithelium, making a neuroendocrine differentiation for the latter plausible.

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