porphyria
Pronunciation: por-FEER-ee-ah
Group of rare metabolic disorders affecting heme biosynthesis, causing accumulation of porphyrin precursors and varied clinical manifestations.
Full Definition
Porphyria encompasses a group of rare inherited or acquired disorders of heme biosynthesis, each caused by deficiency of specific enzymes in the porphyrin synthesis pathway. In pediatric patients, porphyrias can present with acute neurovisceral attacks (acute intermittent porphyria), cutaneous photosensitivity (erythropoietic protoporphyria), or severe hemolytic anemia (congenital erythropoietic porphyria). Symptoms may include abdominal pain, neurological dysfunction, psychiatric symptoms, and skin lesions upon sun exposure. Diagnosis involves measuring porphyrins and their precursors in blood, urine, and stool. Treatment varies by type but may include heme therapy, glucose loading, or sun protection measures.
Usage
Usage note: Umbrella term; specify subtype when known for precision in medical documentation.
In Context
- "The child's recurrent abdominal pain and dark urine led to a diagnosis of acute intermittent porphyria." — Pediatric gastroenterology consultation
- "Erythropoietic protoporphyria was suspected when the toddler developed severe burning and swelling after minimal sun exposure." — Dermatology clinic note