Mesomelic dysplasia, Nievergelt type

Mesomelic dysplasia, Nievergelt type (also known as Nievergelt syndrome) is an extremely rare inherited skeletal disorder characterized by severe shortening and malformation of the middle segments (mesomelic segments) of the limbs — specifically the forearms and lower legs. The condition was first described by Nievergelt in 1944. The hallmark radiographic feature is a distinctive rhomboid or triangular shape of the tibia and fibula, which is considered virtually pathognomonic for this condition. The radius and ulna in the forearms may also be shortened, fused (synostosis), or malformed. Additional skeletal abnormalities can include clubfoot (talipes equinovarus), tarsal and carpal synostosis (fusion of bones in the feet and hands), and limited joint mobility, particularly at the elbows and knees. Stature is typically short due to the disproportionate limb shortening. The condition primarily affects the skeletal system, with the lower limbs generally more severely affected than the upper limbs. Intelligence and other organ systems are typically normal. The severity of limb malformation can vary even within affected families. Diagnosis is usually made in infancy or early childhood based on clinical examination and characteristic radiographic findings. There is currently no cure for Nievergelt-type mesomelic dysplasia. Treatment is symptomatic and supportive, focusing on orthopedic management of limb deformities. Surgical interventions may be considered to correct severe angular deformities, improve limb alignment, or address joint contractures. Physical therapy may help maintain mobility and function. Genetic counseling is recommended for affected individuals and their families.

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