URACHAL CYSTADENOMA WITH ABUNDANT GLYCOGEN - ULTRASTRUCTURAL-STUDY

A cystadenoma arose in the urachus of a 32-year-old man. The mass was a multilocular cystic tumor filled with light yellow mucoid material. It was located in the anterior abdominal wall between the umbilicus an d the dome of the urinary bladder. Overall, the mass was 14 cm x 8 cm x 5 cm, with the largest internal cyst being 6 cm in diameter. The les ion was characterized histologically by columnar cells with focal cell ular and nuclear stratification. Ultrastructural examination revealed columnar cells with abundant glycogen, moderately pleomorphic microvil li without prominent filamentous cores, and apical mucin vacuoles. Nuc lei had pleomorphic contours. An intact basal lamina was present. A si milar urachal cystadenoma has not been described.