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Table 1 Primary locations of endometriosis, their prevalence in patients with endometriosis, clinical features and differential diagnosis [3, 10, 11]

From: Endometriosis: clinical features, MR imaging findings and pathologic correlation

Locations % Clinical features MR differential diagnosis
Bladder 6.4–20 dysuria, hematuria, urinary storage symptoms, suprapubic pain urachal remnant, epithelial and mesenchymal tumours
Ureters 0.01–1 dysmenorrhea, dyspareunia, flank pain (hydronephrosis) obstruction by cervical cancer
Ovaries 20–40 nonspecific pelvic pain dermoids, hemorrhagic cysts, endometrioid and clear cell tumours
Round ligaments 0.3–14 painful inguinal mass, nonspecific pelvic pain  
Retrocervical region, uterosacral ligaments 69.2 painful symptoms, dyspareunia peritoneal metastases
Vagina 14.5 dysmenorrhea, dyspareunia, postcoital spotting cervical and vaginal carcinoma
Rectosigmoid colon 9.9–37 dyschezia, cyclic pain, rectal bleeding colorectal cancer, metastatic implants