Abstract
INTRODUCTION: Pilonidal sinus is a common benign disease that accounts for almost 15% of anal suppurations while basal cell carcinoma is the most common malignancy of the sun-exposed area occurring mainly on the head and neck. We report a case of basal cell carcinoma presented with signs and symptoms of PNS. A 40-year-old male presented with swelling of the lower back for 2 years. On examination, there was a round, mobile, soft 4×2.5cm mass on the sacrococcygeal area. Ultrasound showed subcutaneous cystic lesion. Clinical diagnosis of PNS was done and excisional biopsy was performed under local anesthesia. The result of the histopathological examination was suggestive for basal cell carcinoma. CONCLUSION: Basal cell carcinoma should not be forgotten in differential diagnosis of superficial mass and abscesses.