Poroma

Poroma is a rare benign dermatologic neoplasm.

Eccrine poroma redirect here.

General

• Benign tumour arising from the distal sweat duct.
• Erythematous - gross.

Microscopic

Features:

• Broad sheets of basaloid cells - attached to the epidermis - containing ductal structures - key feature.
• Biphasic stroma:
  1. Edematous stroma.
  2. Sclerotic stroma.
• Moderate nuclear pleomorphism.
• +/-Occasional mitoses.

Notes:

• Area above gland appears crusted.

DDx:

• Trichilemmoma.
• Nodular hidradenoma.
• Porocarcinoma.
• Seborrheic keratosis - have horn cysts.

Images

• 

  EP. (WC)

www:

• Eccrine poroma - low mag. (flickr.com)
• Eccrine poroma - intermed. mag. (flickr.com).

See also

• Dermatologic neoplasms.