Hereditary hemorrhagic telangiectasia vs Other vascular malformations
How to tell Hereditary hemorrhagic telangiectasia and Other vascular malformations apart when a board question makes them look alike.
HHT is autosomal dominant epistaxis plus mucocutaneous telangiectasias and visceral AVMs; other malformations are usually localized or syndrome-specific.
Side by side
Hereditary hemorrhagic telangiectasia causes recurrent epistaxis, mucocutaneous telangiectasias, AV malformations in lung/brain/liver, iron deficiency, and autosomal dominant TGF-beta pathway defects.
Other vascular malformations may be venous, capillary, lymphatic, or arteriovenous lesions but lack the classic familial epistaxis-telangiectasia-AVM triad.
ENG, ACVRL1, or SMAD4 mutations disrupt vascular remodeling and create fragile direct artery-vein connections.
Sporadic or syndrome-associated malformations arise from localized vascular developmental errors without the same systemic HHT pattern.
Recurrent nosebleeds, oral/lip telangiectasias, pulmonary AVM, and family history support HHT.
Isolated port-wine stain, venous lake, lymphangioma, or localized hemangioma supports another vascular lesion.
The trap
Visible vascular lesions alone are not HHT; the repeated bleeding and visceral AVM history are the separator.
The repair move
For vascular lesions, ask whether bleeding plus visceral AVMs and family history are present.
Try a free question
CoreA 42-year-old woman has 20-year history of recurrent severe epistaxis requiring nasal packing and transfusion, multiple small red telangiectasias on her lips, tongue, and fingertips, microcytic anemia from chronic blood loss, and a pulmonary arteriovenous malformation discovered on chest CT after a TIA. Her father and brother had similar histories. Which condition is most likely?
Show answer and explanation
Answer: A. Hereditary hemorrhagic telangiectasia. Hereditary hemorrhagic telangiectasia (HHT, Osler-Weber-Rendu) is autosomal dominant ENG/ACVRL1/SMAD4 (TGF-beta pathway) mutations producing recurrent epistaxis, mucocutaneous telangiectasias, and visceral AVMs (pulmonary, hepatic, cerebral, spinal). Pulmonary AVMs can produce paradoxical embolic strokes and brain abscesses.
Why the other choices are tempting
- B. Marfan syndrome features lens subluxation and aortic root dilation, not mucocutaneous telangiectasias with epistaxis.
- C. Ehlers-Danlos vascular type features arterial fragility and rupture, not the HHT pattern.
- D. Sturge-Weber features facial port-wine stain and leptomeningeal angioma, not mucocutaneous telangiectasias.
- E. Acquired liver disease produces spider angiomas centrally with peripheral capillary radiations, not flat mucocutaneous telangiectasias with familial epistaxis.
Flashcards
Tap a card to flip it.
What clue supports Hereditary hemorrhagic telangiectasia?
Choose Hereditary hemorrhagic telangiectasia when the stem gives this pattern: Hereditary hemorrhagic telangiectasia causes recurrent epistaxis, mucocutaneous telangiectasias, AV malformations in lung/brain/liver, iron deficiency, and autosomal dominant TGF-beta pathway defects.
What clue supports Other vascular malformations?
Choose Other vascular malformations when the stem gives this contrasting pattern: Other vascular malformations may be venous, capillary, lymphatic, or arteriovenous lesions but lack the classic familial epistaxis-telangiectasia-AVM triad.
Quick answers
What is the fastest way to tell Hereditary hemorrhagic telangiectasia from Other vascular malformations?
HHT is autosomal dominant epistaxis plus mucocutaneous telangiectasias and visceral AVMs; other malformations are usually localized or syndrome-specific.
What is the key clue for Hereditary hemorrhagic telangiectasia?
Hereditary hemorrhagic telangiectasia causes recurrent epistaxis, mucocutaneous telangiectasias, AV malformations in lung/brain/liver, iron deficiency, and autosomal dominant TGF-beta pathway defects.
What is the key clue for Other vascular malformations?
Other vascular malformations may be venous, capillary, lymphatic, or arteriovenous lesions but lack the classic familial epistaxis-telangiectasia-AVM triad.
What is the common trap with Hereditary hemorrhagic telangiectasia vs Other vascular malformations?
Visible vascular lesions alone are not HHT; the repeated bleeding and visceral AVM history are the separator.