Retrorectal cyst: a rare tumor frequently misdiagnosed.
BACKGROUND
The rarity of retrorectal cysts and their nonspecific clinical presentations often lead to misdiagnoses and inappropriate operations. In recent years, several such patients have been referred to our institutions for evaluation and treatment of misdiagnosed retrorectal cysts. A review of these patients is presented.


METHODS
Medical records of the colorectal surgery divisions at two institutions were reviewed. Patients found to have previously misdiagnosed retrorectal cysts were identified. Preliminary diagnoses, radiologic examinations, operative procedures, and final diagnoses were obtained.


RESULTS
Seven patients with retrorectal cysts who had been misdiagnosed before referral were identified. These patients had been treated for fistulae in ano, pilonidal cysts, perianal abscesses; psychogenic, lower back, posttraumatic, or postpartum pain, and proctalgia fugax before the correct diagnosis was made. Patients underwent an average of 4.1 operative procedures. Physical examination in combination with CT scanning made the correct diagnosis in all patients. All patients underwent successful resection through a parasacrococcygeal approach, and six of seven did not require coccygectomy. The resected tumors included four hamartomas, two epidermoid cysts, and one enteric duplication cyst.


CONCLUSIONS
Retrorectal cysts are a rare entity that can be difficult to diagnose without a high index of clinical suspicion. A history of multiple unsuccessful procedures should alert the clinician to the diagnosis of retrorectal cyst. Once suspected, the correct diagnosis can be made with physical examination and a CT scan before a definitive surgical procedure.
Singer
Marc A
MA
Department of Surgery, The University of Illinois at Chicago, 60612, USA.
Cintron
José R
JR
Martz
Joseph E
JE
Schoetz
David J
DJ
Abcarian
Herand
H
D000038:Abscess / Q000175:diagnosis; D000293:Adolescent; D000328:Adult; D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D004814:Epidermal Cyst / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D005260:Female; D005401:Fissure in Ano / Q000175:diagnosis; D006222:Hamartoma / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D006801:Humans; D008297:Male; D008487:Medical History Taking; D008875:Middle Aged; D010146:Pain / Q000209:etiology; D010808:Physical Examination; D010864:Pilonidal Sinus; D035583:Rare Diseases / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D012002:Rectal Diseases / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D012003:Rectal Fistula / Q000175:diagnosis; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome