Astanga Hrudaya
तयोः कोष्ठेऽसृजा पूर्णे नश्येद्यातेन पूयताम्। पार्श्वयोः पृष्ठवंशस्य श्रोणीकर्णौ प्रति स्थिते॥१७॥
which (blood) later gets converted into pus leading to death Prishtagata marma - vital sports of the back: On either side of the vertebral column, situated on (against) the earlike bones of the pelvis,
english translation