Astanga Hrudaya
स्वतन्त्रः स्वाश्रये दुष्टः परतन्त्रः पराश्रये । पिण्डितत्वादमूर्तोऽपि मूर्तत्वमिव संश्रितः ॥ ४० ॥
If the mass develops in its own (of vata) seat, i.e. pakvasaya- large intestine, then the disease is primary / independent and if it develops in the seat of the other Doshas (pitta and kapha) then the disease is secondary / dependent. Though the mass is not having any shape, still it is considered to have a shape because of aggregation at one place and forming a bolus / elevation. (aggregated at one place) forming an elevation.
english translation
svatantraH svAzraye duSTaH paratantraH parAzraye । piNDitatvAdamUrto'pi mUrtatvamiva saMzritaH ॥ 40 ॥
hk transliteration by Sanscript