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Ginecología y obstetricia de México
Print version ISSN 0300-9041
Abstract
LOPEZ-RUIZ, Claudia Cristina et al. Pelvic retroperitoneal schwannoma presenting as a leiomyoma: Case report and review of literature. Ginecol. obstet. Méx. [online]. 2018, vol.86, n.3, pp.217-223. ISSN 0300-9041. https://doi.org/10.24245/gom.v86i3.1964.
OBJECTIVE
Present the case of a patient with a pelvic mass which was reported as myoma and turned out to be a schwannoma.
CLINICAL CASE
We report a case of a 53 year old female that presented with abdominal and low back pain, also distention, constipation and dyspareunia for 3 months. Transvaginal ultrasound suggested leiomyoma. Laparoscopic hysterectomy was planned. On laparoscopy, a retroperitoneal 9 cm mass was seen over de sacrum. The procedure was stopped for further studies. Magnetic resonance images detected a large presacral solid, tumor of 8 cm. The patient was scheduled for laparoscopy with oncology group and the mass was resected. No complications were experienced intra or postoperatively. The final histological diagnosis was a cellular schwannoma, that was S-100- positive, and smooth muscle actin-negative. A follow up consultation 6 months later showed a significant improvement of the lower abdominal pain.
CONCLUSIONS
Schwannomas rarely present as pelvic masses. We report a woman with a pelvic mass initially diagnosed as a uterine fibroid but subsequently proven to be a retroperitoneal schwannoma. This rare entity is usually asymptomatic or has nonspecific symptoms leading to misdiagnosis. Preoperative diagnosis of a schwannoma is not easy for a lack of distinguishing features on imaging studies. The prognosis of schwannoma is excellent, and the excision is usually curative.
Keywords : Retroperitoneal schwannoma; Leiomyoma; Cellular schwannoma; Lower abdominal pain.