Astanga Hrudaya
एकाधोवदनो मध्ये कट्याः सद्यो निहन्त्यसून्। ऋतेऽश्मरीव्रणाद्विद्धस्तत्राप्युभयतश्च सः॥११॥
injury to it causes death quickly. Even without the formation of an ulcer caused by a urinary stone (while removal of stone), even in this, if this ulcer (formed by urinary stone) is formed on both sides, it still causes quick death.
english translation