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The diagnostic difficulties encountered with atypical tumor growth are reported in a 29-year-old female with recurrent carcinoma of the uterine cervix. Following a Wertheim-Meigs procedure and resection of local tumor recurrence eight months later, a second recurrence was detected on CT as a purely cystic lesion in the left pelvic wall. Although the size of the cyst subsequently increased, the patient remained asymptomatic until slight pain developed in the left leg 28 months after initial therapy. One month later, limping was noticed; plain radiography showed a large osteolytic lesion of the left hip and on I.V.U., a dilatation of the left renal collecting system was observed. Pelvic CT showed only minimal solid tissue components within a large cyst. Multiple needle aspirations of the cyst and cytological examinations of the fluid obtained showed no evidence of tumor cells. A definitive histological diagnosis of metastasizing squamous cell carcinoma was only reached after surgery.