Mucocoele of the appendix

A 65-year-old male presented with pain in the right lower quadrant. Physical examination was normal. Haemogram revealed no significant abnormality. Ultrasound Abdomen revealed a tubular anechoic cystic lesion in right Iliac fossa with good through transmission measuring 6.0 x 2.5 cm. Contrast enhanced spiral CT of the abdomen showed well marginated thin walled tubular structure of fluid attenuation (13HU) posterior to the caecum. No calcification was seen in it. No inflammation of the surrounding fat was seen. There was no evidence of ascites. Provisional diagnosis of Mucocoele of appendix was made and was confirmed on surgery and histopathology. Fig. 2 & 3: CT sections showing low attenuating smooth lobulated mass in relation to the caecum suggestive of mucocoele of appendix.