A Calcium Enterolith in a Patient with Crohn’s Disease and Its In Vitro Dissolubility in Citric Acid

Figure 4

Scanning electron microscopy images. The enterolith piece immersed in water revealed a multilayered structure (a), containing crystalloid microparticles (b). In the enterolith piece immersed in citric acid solution, crystalloid microparticles were absent (c, d).

(a)

(b)

(c)

(d)