This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Research
Perianal and Perineal Rhabdomyosarcomas - A Retrospective Multicenter Study of 35 Cases
Donglin Ren
Corresponding Author
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Purpose: Perianal/perineal rhabdomyosarcoma (PRMS) is rare, easy to be misdiagnosed and has poor prognosis. This study was designed to analyze the clinical, diagnostic, pathological and prognostic features of PRMS, and to explore its therapeutic modality.
Methods: Clinical data of PRMS patients in the Sixth Affiliated Hospital and the Cancer Center of Sun Yat-sen University and related Chinese literatures published between 1987 and 2018 were described and analyzed. Chi-square test was used to test the differences between groups. The Kaplan-Meier methods were used to estimate and compare survival rates.
Results: 35 patients, 20 identified in the Chinese literatures and 15 of our center from 1997 to 2019, were included in this study. 34 cases presented as perianal mass and one presented as inguinal mass. 20 patients complained about pain and 16 cases were misdiagnosed as perianal abscess, in which pain was found related to misdiagnosis (p＜0.05). The average time from symptoms to pathological diagnosis was 3.1 months. 13 cases were categorized into IRS group III/IV and 20 cases into stages 3/4. 14 Cases were diagnosed as embryonal rhabdomyosarcoma pathologically and 9 as alveolar rhabdomyosarcoma. Five patients survived for more than two years, three of them survived for more than five years. The overall survival rates of two years and five years were 32% and 24% respectively, in which misdiagnosis contributes to poor prognosis (p＜0.05). MRI showed that PRMS was closely related to external anal sphincter in 10 cases.
Conclusion: PRMS is easy to be misdiagnosed, which could lead to worse outcome. Patients with painful perianal mass should be evaluated to exclude PRMS. MRI shows PRMS is closely related to external anal sphincter. Comprehensive therapy including radical operation and chemotherapy is recommended.
Keywords
Perianal, Perineal, Abscess, Rhabdomyosarcoma
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
History
CURRENT STATUS: Posted
Version 1
Posted 01 Jun, 2020
No community comments so far
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Oncology
Learn more about our company.
This is a preprint. It has not completed peer review.
Research
Perianal and Perineal Rhabdomyosarcomas - A Retrospective Multicenter Study of 35 Cases
Donglin Ren
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
History
CURRENT STATUS: Posted
Version 1
Posted 01 Jun, 2020
No community comments so far
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Oncology
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Purpose: Perianal/perineal rhabdomyosarcoma (PRMS) is rare, easy to be misdiagnosed and has poor prognosis. This study was designed to analyze the clinical, diagnostic, pathological and prognostic features of PRMS, and to explore its therapeutic modality.
Methods: Clinical data of PRMS patients in the Sixth Affiliated Hospital and the Cancer Center of Sun Yat-sen University and related Chinese literatures published between 1987 and 2018 were described and analyzed. Chi-square test was used to test the differences between groups. The Kaplan-Meier methods were used to estimate and compare survival rates.
Results: 35 patients, 20 identified in the Chinese literatures and 15 of our center from 1997 to 2019, were included in this study. 34 cases presented as perianal mass and one presented as inguinal mass. 20 patients complained about pain and 16 cases were misdiagnosed as perianal abscess, in which pain was found related to misdiagnosis (p＜0.05). The average time from symptoms to pathological diagnosis was 3.1 months. 13 cases were categorized into IRS group III/IV and 20 cases into stages 3/4. 14 Cases were diagnosed as embryonal rhabdomyosarcoma pathologically and 9 as alveolar rhabdomyosarcoma. Five patients survived for more than two years, three of them survived for more than five years. The overall survival rates of two years and five years were 32% and 24% respectively, in which misdiagnosis contributes to poor prognosis (p＜0.05). MRI showed that PRMS was closely related to external anal sphincter in 10 cases.
Conclusion: PRMS is easy to be misdiagnosed, which could lead to worse outcome. Patients with painful perianal mass should be evaluated to exclude PRMS. MRI shows PRMS is closely related to external anal sphincter. Comprehensive therapy including radical operation and chemotherapy is recommended.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5