Tubular apocrine adenoma

Area of Science:

• Dermatopathology
• Surgical Pathology

Background:

• Tubular apocrine adenoma (TAA) is a rare benign appendageal tumor.
• TAA requires careful classification within appendage tumors, especially when associated with organoid epithelial nevi.
• Differential diagnosis includes metastatic adenocarcinoma.

Observation:

• The study examined two cases of TAA using light, histochemical, and electron microscopy.
• Tumors presented as dermal and subcutaneous lobular masses with tubular structures.
• Duct-like connections to the epidermis were observed, with tubules containing apocrine epithelial cells exhibiting hyaline or clear cell differentiation.

Findings:

• Histochemical and ultrastructural analyses confirmed apocrine differentiation of tumor cells.
• Tumor cells displayed characteristics consistent with apocrine lineage.
• The scalp is a common localization for this tumor.

Implications:

• TAA should be considered in the differential diagnosis of skin tumors, particularly those with apocrine features.
• Distinguishing TAA from similar entities like nevus syringocystadenoma papilliferum is crucial for accurate diagnosis and patient management.
• Understanding TAA's histopathological features aids in its classification among appendage tumors.