Patient: Male, 77 Final Diagnosis: Pilonidal cyst Symptoms: Severe pain ?bleeding mass Medication: — Clinical Procedure: Local radiation therapy ? neoadjuvant chemotherapy ? surgical resection Specialty: Surgery Objective: Rare disease Background: Pilonidal disease is a common inflammatory condition mostly affecting young males. Malignant degeneration of a pilonidal cyst is rare, with incidence estimated at 0.1%. The most common type is squamous cell carcinoma and the treatment of choice remains en block resection of the lesion. Case Report: We present the case of a patient with locally advanced squamous cell carcinoma arising in a pilonidal cyst, due to misdiagnosis of the disease during his first treatment. Conclusions: Detailed histological examination of all excised pilonidal cyst lesions is essential and any histological suspicion should prompt a wider excision.
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