大きな尿道舟状窩結石の1例

A case of large calculus lodged in the fossa navicularis

　症例は57歳，男性。亀頭部の疼痛，腫脹と排尿困難を主訴に当科を受診した。骨盤部単純X線写真にて骨盤外に3.4×2.7cmの石灰化像を認めた。排尿時膀胱尿道造影および骨盤部CTにて尿道舟状窩に嵌頓した結石と診断された。腰椎麻酔下に空圧式結石破砕装置を用いた経尿道的尿道結石砕石術を施行し，残石なく治療することができた。

A 57-year-old male visited our hospital complaining of difficult urination and pain and swelling of glans penis. A stony hard mass of approximately a golf ball's size was palpated at the glans. Plain X-ray of the pelvis demon-strated a large calculus measured 3.4×2.7 cm. Transurethral urethrolithotripsy using the Lithoclast® was performed without any postoperative complications. The stone was composed of calcium phosphate, calcium carbonate and magnesium ammonium phosphate.