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1.

Alkaptonuria

Alkaptonuria is caused by deficiency of homogentisate 1,2-dioxygenase, an enzyme that converts homogentisic acid (HGA) to maleylacetoacetic acid in the tyrosine degradation pathway. The three major features of alkaptonuria are dark urine or urine that turns dark on standing, ochronosis (bluish-black pigmentation in connective tissue), and arthritis of the spine and larger joints. Ochronosis generally occurs after age 30 years; arthritis often begins in the third decade. Other manifestations can include pigment in the sclera, ear cartilage, and skin of the hands; aortic or mitral valve calcification or regurgitation and occasionally aortic dilatation; renal stones; prostate stones; and hypothyroidism. [from GeneReviews]

MedGen UID:
1413
Concept ID:
C0002066
Disease or Syndrome
2.

Thickened Achilles tendon

An abnormal thickening of the Achilles tendon. [from HPO]

MedGen UID:
214714
Concept ID:
C0919997
Finding

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