Characteristic appearance of phalanges as shown in the picture below is best seen at?
A. Rib margins.
B. Medial margin of proximal humerus.
C. Radial border of middle phalanx.
D. Lamina dura.
Characteristic appearance of phalanges as shown in the picture above represents Subperiosteal bone resorption is the most consistent and specific finding of hyperparathyroidism and is virtually pathognomonic of the condition.
However subperiostel resorption is seen in all the options provided but option (C) is most characteristic and thus most correct.
Subperiosteal bone resorption characteristically affects the phalangeal tufts, the radial aspect of the proximal and middle phalanges of the fingers, the metatarsals, the rib margins, the lamina dura, and the medial margins of the proximal humerus, femur, and tibia.
Resorptive changes on both the periosteal and endosteal sides in hyperparathyroidism mainly affect the middle phalanges and are most common on the radial side.
Subperiosteal resorption along the radial margin of the phalanges is virtually pathognomonic.