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Pigmented lesions in unusual anatomic sites
1Istituto Nazionale per lo Studio e la Cura dei Tumori, Milan, Italy.
Seminars in Diagnostic Pathology
|December 26, 2003
Summary
This review covers melanin-containing lesions outside the skin, including benign and malignant tumors. Histology and ancillary techniques help identify melanocytic tumors but not their origin.
Area of Science:
- Dermatopathology
- Oncology
- Histology
Background:
- Melanin-containing lesions commonly occur in the skin.
- Extracutaneous melanocytic lesions are rare and diverse.
- These lesions can be reactive, benign, or malignant.
Purpose of the Study:
- To review pigmented melanin-containing lesions in extracutaneous locations.
- To discuss melanocytic lesions of the mucosae, nervous system, and organs.
- To cover rarer pigmented tumors in unusual sites.
Main Methods:
- Literature review of pigmented extracutaneous lesions.
- Analysis of histological features and clinical behavior.
- Discussion of proposed explanations for ectopic locations.
Main Results:
- Extracutaneous pigmented lesions encompass reactive processes, benign neoplasms, and malignant tumors.
- Melanocytic lesions can occur in diverse sites including mucosae and the nervous system.
- Histological evaluation and ancillary techniques are crucial for diagnosis.
Conclusions:
- Detailed morphological evaluation is essential for diagnosing melanocytic tumors.
- Ancillary techniques aid in determining melanocytic nature and biologic potential.
- Distinguishing primary from metastatic lesions requires additional clinical information.