Table 1: Reported cases of endometriosis in males.

SourceAgeRisk factorsClinical presentationImmunohistochemistryLocation, sizeTreatmentFollowup

Beckman et al. [1]78Prolonged estrogen therapyNot reportedNot reportedProstatic urethral crestNot reportedNot reported

González et al. [2]52Cirrhosis, spironolactone use, 2x inguinal hernia repairStabbing pelvic painEpithelium: ER+, PR+ 
Stroma: CD10+
R. inguinal area, attached to bladder serosa, 2.5 cmSurgical resectionNot reported

Fukunaga [3]699 years of hormonal therapy for prostatic adenocarcinoma, 1 year of radiotherapy and chemotherapySwelling of the left testis on a routine examinationVimentin+, CD10+, ER+, PR+L. paratestis,  cmBilateral orchiectomyNot reported

Giannarini et al. [4]27Not reported2 weeks of postcoital left scrotal painER+, PR+, CK7, 8, 18, 19+, vimentin, CEA, CD10−Head of the L. epididymis, 1.7 cmSurgical resectionAsymptomatic at 5 years

Young and Scully [5]823 years of DES for prostatic adenocarcinomaPalpable firm mass on the tail of the epididymis on routine examinationNot reportedBetween vas deferens and testis, close to the tail of the epididymis, 5 cmBilateral orchiectomyDied 9 months later due to metastatic prostatic adenocarcinoma

Jabr and Mani [6]52Cirrhosis secondary to Hep. C; inguinal hernia repair with meshRight lower quadrant painER+, PR+, CD10+Cystic mass attached to urinary bladder and right inguinal area,  cmSurgical resectionAsymptomatic

Martin and Hauck [7]83TACE therapy for prostatic adenocarcinomaNot reportedNot reportedLower abdominal wallNot reportedNot reported

Oliker and Harris [8]80Prolonged hormonal therapyNot reportedNot reportedBladderNot reportedNot reported

Pinkert et al. [9]50TACE therapy for prostatic adenocarcinomaHematuria, hydroureterH&EUlceration surrounding trigonal area, bladder muscular wallSurgical resection, discontinued hormonal therapyAsymptomatic at 4 years

Tulunay et al. [10]43Within clear cell carcinoma of tunica vaginalisHemoptysis, abdominal pain, weight lossH&ELeft paratestisLeft orchiectomyDied 2 weeks later due to tumor progression

Schrodt et al. [11]735-year hormonal therapy for prostate adenocarcinomaRight hydronephrosisNot reportedRight ureterovesical junctionNot reportedNot reported

Simsek et al. [12]49 Inguinal hernia repair ×3Intraoperative hernia repair, mass discovered along the spermatic cordH&ELeft ductus deferens,  cmSurgical resectionNot reported

Taguchi et al. [13]74Radical prostatectomy for prostatic adenocarcinoma; leuprorelin and ethinylestradiol for 5 yearsPainless macrohematuriaER+, PR+, CD10+, PSA−Left ureteral orifice, 3 cmSurgical resection, discontinued hormonal therapyTumor shrank on imaging; no PSA elevation at 6 months

Zamecnik and Hostakova [14]46Obesity, BMI of 31Cyst found adjacent to seminomaEpithelium: ER+, PR+, CK5,6,7+, calretinin+, EMA+ 
Stroma: PR+, calretinin+, CD10+
Within mesothelial cyst of tunica vaginalis; 4 mm focus of endometriosis found in 7 mm cystRight-sided orchiectomyNot reported

Scully [15]Not reportedHormonal therapy for prostate adenocarcinomaNot reportedNot reportedScrotumNot reportedNot reported

Scully [15]Not reportedHormonal therapy for prostate adenocarcinomaNot reportedNot reportedScrotumNot reportedNot reported

Present case40Obesity, BMI of 35.7Right lower quadrant abdominal pain radiating to the right flankCK7+, ER+, CD10+, CD15+, GATA-3−Right vas deferens,  cmSurgical resectionAsymptomatic at 2 weeks