Cylindroma and eccrine spiradenoma coexistent in the same lesion

Area of Science:

• Dermatopathology
• Oncology
• Histology

Background:

• Eccrine spiradenoma is a benign adnexal tumor of eccrine sweat gland origin.
• Cylindroma, also known as dermal eccrine cylindroma, is a benign adnexal tumor whose precise origin remains debated.
• Both tumors present as cutaneous nodules.

Observation:

• Two cases are presented where a single clinical nodule harbored both cylindroma and eccrine spiradenoma.
• One nodule was located on the scalp, the other on the face.
• Histopathological examination confirmed the presence of both distinct tumor types within the same lesion.

Findings:

• The co-localization of cylindroma and eccrine spiradenoma within a single nodule provides circumstantial evidence.
• Histochemical and enzyme histochemical findings for cylindroma have been variable, contributing to its controversial origin.
• The study supports the hypothesis of a similar derivation for both cylindroma and eccrine spiradenoma.

Implications:

• This finding may help elucidate the controversial histogenesis of cylindroma.
• Understanding the shared origin could impact the classification and diagnosis of adnexal tumors.
• Further research into the developmental pathways of eccrine structures is warranted.