Crystallographic Identifications of Calcium Deposits 



159 



The third group is that of chondrocalcinosis (Table 3). It includes eight cases of 

 primary chondrocalcinosis, most of these having been found by routine biopsy or 

 post-mortem examination, and only two of these cases were accompanied by clinical 



Table 1. Cases in which the calcareous deposit 



^ted of apatite (A 



Mo. of 



cases 



No. of 

 sami)les 



Calcinosis . 



circumscripta 



("chalk gout") 

 universalis 

 milk-alkali syndrome 



Atheromatous plaques 



Calcified deposits in the shoulder's rotator 

 cuff (so-called peritendinitis calcarea) 



Table 2. Cases in which the calcareous deposits consisted of apatite (A), or zchitlockite (W), 

 or a mixture of the two in a single sample (A~i-W) 



Calcifications 

 presumably of 

 parasitic origin 



liver 



spleen 



signs of polyarthrosis. Among the 36 samples of different articular tissues thus 

 examined including fibro-cartilage of synchondroses, 29 instances of calcium pyro- 

 phosphate dihydrate were observed. The only case where apatite was mixed with 

 pyrophosphate within the same sample was that of a meniscus from a knee with 



