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1.

Diaphyseal medullary stenosis-bone malignancy syndrome

Diaphyseal medullary stenosis with malignant fibrous histiocytoma is an autosomal dominant bone dysplasia characterized by pathologic fractures due to abnormal cortical growth and diaphyseal medullary stenosis. The fractures heal poorly, and there is progressive bowing of the lower extremities. In 2 families, affected individuals also showed a limb-girdle myopathy, with muscle weakness and atrophy. Approximately 35% of affected individuals develop an aggressive form of bone sarcoma consistent with malignant fibrous histiocytoma or osteosarcoma. Thus, the disorder may be considered a tumor predisposition syndrome (summary by Camacho-Vanegas et al., 2012). [from OMIM]

MedGen UID:
350613
Concept ID:
C1862177
Disease or Syndrome
2.

Osteomyelitis leading to amputation due to slow healing fractures

MedGen UID:
351263
Concept ID:
C1864975
Finding
3.

Mitochondrial DNA depletion syndrome 6 (hepatocerebral type)

MPV17-related mitochondrial DNA (mtDNA) maintenance defect presents in the vast majority of affected individuals as an early-onset encephalohepatopathic (hepatocerebral) disease that is typically associated with mtDNA depletion, particularly in the liver. A later-onset neuromyopathic disease characterized by myopathy and neuropathy, and associated with multiple mtDNA deletions in muscle, has also rarely been described. MPV17-related mtDNA maintenance defect, encephalohepatopathic form is characterized by: Hepatic manifestations (liver dysfunction that typically progresses to liver failure, cholestasis, hepatomegaly, and steatosis); Neurologic involvement (developmental delay, hypotonia, microcephaly, and motor and sensory peripheral neuropathy); Gastrointestinal manifestations (gastrointestinal dysmotility, feeding difficulties, and failure to thrive); and Metabolic derangements (lactic acidosis and hypoglycemia). Less frequent manifestations include renal tubulopathy, nephrocalcinosis, and hypoparathyroidism. Progressive liver disease often leads to death in infancy or early childhood. Hepatocellular carcinoma has been reported. [from GeneReviews]

MedGen UID:
338045
Concept ID:
C1850406
Disease or Syndrome
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