**1. Introduction**

100 Endometriosis - Basic Concepts and Current Research Trends

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*presence and activity of immune cells in human ovarian and abdominal wall* 

Kraczkowski J., Sikora J., Opławski M., Nowak A., Skręt A. & Basta A.: *The obstetrical history in patients with Pfannenstiel scar endometriomas – an analysis of 81* 

> Endometriosis is one of the most enigmatic diseases of the female because its cause and pathophysiology remain poorly understood. Although the histological diagnosis of endometriosis is usually easy to make, there are diagnostic problems in relation to certain aspects such as the atypias and neoplastic alterations of the endometriotic glandular and stromal components and in cases of endometriosis in unusual places the small size of specimens available for histological examination does not aid the correct diagnosis. An effort will be made in this chapter to address the various problems and the most commonly asked questions about endometriosis.
