Osseous Tumours. 357 



6. 386. Exostosis of Femur. — Section of the lower end of a 

 left femur — macerated, illustrating the above. 



An exostosis of cancellous tissue arises from the front 

 of the shaft near its lower end. G. C. 3417. 



6, 387. Exostosis of Rib. — Rib, said to be the sixth — macerated, 

 illustrating the above. 



A large nodular exostosis projects downwards from the 

 lower border, near the sternal end of the shaft. 



B.C. I. 6. M. 15. 



6. 388. Exostosis of Rib, probably inflammatory.— Portions 



of two ribs, macerated — illustrating the above. 



From the body of Catherine F., who died in 1832, aged 70. Between 

 30 and 40 years before death, Iier left breast had been removed by the 

 late John Bell, in the Royal Infirmary, Edinburgh, and subsequently part 

 of a rib had also been excised. 



Most probably, therefore, the bar of bone between the two 

 ribs has been the result of previous irritation, and thus is not 

 a true exostosis. The bar was jointed to the upper of the two 

 ribs by a ligament and joint, G. C. 1298. 



Presented by Dr Coldstream. 



6. 389. Exostosis below Great Toe-Nail.— Section of a distal 



phalanx — in spirit, illustrating the above. 

 From a girl aged 16. 



This is a common form of exostosis ; it lifts up the nail, 

 and causes irritation, often mistaken for "ingrowing toe-nail." 



G. C. 2122. 

 Presented hy Benjamin Bell, F.R.C.S.E., 1840. 



6. 390. Exostosis below Great Toe-Nail.— Other half of the 



same exostosis — macerated, illustrating the above. G. C. 2123. 

 Presented hy Benjamin Bell, F.R.C.S.E., 1840. 



