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.
From the Nuclear Medicine Department, Taleghani Medical Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Received for publication April 15, 2019; revision accepted June 4, 2019.
Conflicts of interest and sources of funding: none declared.
Correspondence to: Ghazal Norouzi, MD, Nuclear Medicine Department, Taleghani Medical Center, Shahid Arabi St, Velenjak District, Tehran 1985711151, Iran. E-mail: firstname.lastname@example.org.
Online date: July 15, 2019