A 41-year-old female patient presented with a tortuous swelling over the left side of the scalp and face as shown in the image given below. On local examination, the swelling was pulsatile. On auscultation, a bruit was heard. Which of the following is the most likely diagnosis?

Explanation

## Correct Answer: A. Cirsoid Aneurysm A **cirsoid aneurysm** is a tortuous, dilated network of arteries (arteriovenous malformation with aneurysmal dilatation) that presents as a pulsatile, compressible swelling. The discriminating clinical triad here is: (1) tortuous swelling over scalp/face, (2) pulsatile character on palpation, and (3) audible bruit on auscultation. The bruit arises from turbulent blood flow through the dilated, tortuous vessels. Cirsoid aneurysms are typically congenital arteriovenous malformations, though they can be acquired after trauma. They are most common on the scalp and face in Indian patients. The tortuous appearance (resembling a "bag of worms") is pathognomonic. Management depends on size and symptoms: small asymptomatic lesions may be observed, while symptomatic or enlarging lesions require intervention (embolization, surgical excision, or sclerotherapy). The pulsatile nature and bruit distinguish it from simple venous malformations or lipomas. On imaging (CT/MRI angiography), you would see early arterial filling with rapid venous drainage, confirming the arteriovenous shunt. ## Why the other options are wrong **B. Liposarcoma** — Liposarcoma is a malignant soft-tissue tumor that presents as a painless, slowly enlarging mass. It is NOT pulsatile and does NOT produce a bruit on auscultation. While it may occur on the scalp/face, the absence of pulsatility and bruit rules it out. Liposarcoma is firm, non-compressible, and fixed to deeper structures—opposite of the clinical findings here. **C. Varicocele** — Varicocele is a venous condition affecting the pampiniform plexus, classically seen in the scrotum, not the scalp or face. While varicoceles can be palpable and compressible, they do NOT produce a bruit. Varicoceles lack the arterial component and tortuous arterial dilatation seen in cirsoid aneurysms. This is a distractor based on the 'tortuous' descriptor. **D. Neurofibromatosis** — Neurofibromatosis (NF1) presents with café-au-lait spots, neurofibromas, and optic nerve gliomas, not a pulsatile, tortuous vascular swelling with bruit. While NF1 can have vascular complications (dysplasia, stenosis), it does NOT classically present as a pulsatile scalp mass with audible bruit. The clinical presentation is entirely vascular, not neurofibromatous. ## High-Yield Facts - **Cirsoid aneurysm** = tortuous arteriovenous malformation with aneurysmal dilatation; presents as 'bag of worms' appearance on scalp/face. - **Pulsatile + bruit** = hallmark of cirsoid aneurysm; bruit indicates arteriovenous shunt with turbulent flow. - **Congenital origin** most common; can be acquired post-trauma; scalp and face are most frequent sites in Indian population. - **Compressible swelling** that refills when pressure released; may have audible thrill on palpation. - **Imaging of choice**: CT/MR angiography shows early arterial filling with rapid venous drainage (arteriovenous shunt). - **Management**: observation for small asymptomatic lesions; embolization, surgical excision, or sclerotherapy for symptomatic/enlarging lesions. ## Mnemonics **CIRSOID = Congenital + Irregular + Rapid flow + Shunt + Obvious bruit + Involved scalp/face + Dilated** Each letter captures a key feature: Congenital origin, Irregular tortuous appearance, Rapid arterial flow, Shunt (AV), Obvious bruit, Involved scalp/face, Dilated vessels. Use when you see 'tortuous + pulsatile + bruit' on scalp. **PULSATILE BRUIT = Pulsatile + Ultrasound shows AV shunt + Low resistance + Scalp/face + Arteriovenous + Tortuous + Imaging confirms + Lesion compressible + Early venous filling** Memory hook: Any pulsatile scalp swelling with bruit = think AV malformation first. The bruit is the giveaway—it means arterial flow meeting venous drainage. ## NBE Trap NBE may pair "tortuous swelling" with varicocele (also tortuous) to trap students who confuse venous and arteriovenous pathology. The bruit is the discriminator—varicoceles do NOT produce bruits because they lack the arterial component. ## Clinical Pearl In Indian clinical practice, cirsoid aneurysms of the scalp are often managed conservatively if asymptomatic, but patients must be counseled about risk of rupture with trauma (common in outdoor work). Endovascular embolization is increasingly available in tertiary centers and is preferred over surgery to avoid cosmetic deformity and bleeding complications. _Reference: Bailey & Love's Short Practice of Surgery, Ch. 54 (Vascular Surgery); Robbins Pathology, Ch. 10 (Vascular Disorders)_