PTCs are rare clinical entities and are believed to originate from the mesothelium or to be a remnant of the Mullerian duct and Wolffian duct 1. Although the term paraovarian cyst is also used, generally, the terminology depends on the location of the cyst. When adjacent to fallopian tubes it is referred to as PTC. Most reported cases of PTCs have occurred in pediatric patients 4. It has been hypothesized that PTCs increase in size with hormonal activity 5. Larger lesions may become symptomatic, causing pressure or pain. An association between PTCs and obesity has been suggested 6. Our case was not considered to be obese and she was in the normal range for weight and height percentile. PTCs usually consist of either unciliated epithelium, ciliated cuboidal epithelium, or ciliated columnar epithelium 7,8. Inside the cyst in our case there was serous fluid and the epithelium was of ciliated columnar type.
US, computed tomography, or MRI may be performed in preoperative evaluation. Sonographically, a PTC is unilocular, with serous fluid inside, without internal echoes, and has a smooth wall 9. Because of the possibility that ovarian torsion may be one of the differential diagnoses as well, Pelvic Doppler ultrasonography was performed in our patient. A unilocular cystic mass with no solid components or septations adjacent to the right fallopian tube was observed and there was no blood perfusion. The right ovary was not visible by US. Computed tomography or MRI may also be performed in the diagnostic workup in these patients. MRI findings of these paramesonephric or mesonephric remnants have been rarely reported 10. It has been suggested that demonstration of a normal ipsilateral ovary close to, but separated from, the adnexal cyst may be an important MRI finding for the diagnosis of paraovarian cyst. MRI finding in our case was a large unilocular cystic mass at the level of the right ovary (Fig. 1). US and MRI findings in these patients are nonspecific and none of these imaging techniques have specific criteria for a definite diagnosis.
Treatment options for PTCs include cystectomy, fenestration of the cyst, and aspiration of cyst fluid 11. Enucleation of the PTC with an attempt at tubo-ovarian salvage should be considered. Preservation of fallopian tubes and ovary during excision of the cyst may increase the future reproductive potential of these patients in general. Enucleation of the PTC was performed uneventfully in our patient. At the end of the operation abdominal exploration through the same insicion revealed a striking finding: an inflamed flegmonous appendicitis. Standard appendectomy was added to the surgical procedure.
Literature review of the association of appendicitis with other pelvic pathologies shows only adult cases and include various pelvic pathologies. These are tubal pregnancy 12–16, ovarian cyst 17, hemorrhagic corpus luteal cyst 18, and bleeding ovarian follicle with hemoperitoneum 19. Parovarian cyst torsion including rupture of the left ovary associated with flegmonous appendicitis has also been reported 20. The association of appendicitis with pediatric pelvic pathologies includes mostly ovarian torsion and there are seven pediatric cases of ovarian torsion associated with appendicitis 21. A case of supurative salpingitis associated with flegmonous appendicitis has also been reported in an 11-year-old girl 22. When PTC and acute appendicitis coexist in a same patient, it may not be evident as to which one is the primary event. In our case it appears that PTC with its huge volume full of serous fluid around the appendix may produce local irritation and later on may have contributed to appendicitis. Therefore, we suppose that PTC in our case occurred first and distal appendicitis second. To our knowledge, there is no pediatric case of PTC associated with a flegmonous appendicitis in the English language literature.
Physicians hesitate to accept the possibility of double pathology in the same patient. This reluctance stems from an experience that it is rare for two coincident pathological conditions to occur simultaneously. This case shows the importance of considering multiple pathologic disorders in a patient with an acute surgical abdomen. To our knowledge, this is the second report of a combination of PTC and flegmonous appendicitis and the first pediatric case. As shown in this case, PTC and flegmonous appendicitis can be seen together as distinct entities in children.
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Conflicts of interest
There are no conflicts of interest.