Sebaceous cyst MCQ and important points

A cystic swelling with a punctum is likely to be:

a. Lipoma

b. Dermoid

c. Neurofibroma

d. Sebaceous cyst ✅

Answer: d

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Solution

• A cystic swelling with a punctum is a sebaceous cyst.

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Classification of Cysts

A. Congenital

• Dermoids

• Thyroglossal cysts

• Urachal cysts

B. Acquired

• Retention cysts → Sebaceous cysts, Bartholin cysts, parotid/breast cysts, ranula

• Distention cysts → Colloid goiter, ovarian cysts, lymph cysts

• Exudation cysts → Hydrocele

C. False cysts (no epithelial lining)

• Pseudocyst of pancreas

• Hematoma

• Plunging ranula

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Notes on Ranula

• Ranula: Retention cyst due to obstruction of salivary glands

• Plunging ranula: Extravasation cyst due to obstruction and rupture of sublingual salivary glands

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Swellings that are brilliantly transilluminant

• Ranula

• Cystic hygroma & lymph cyst

• Primary hydrocele

• Epididymal cyst

• Meningocele

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Swellings that are cross-fluctuant

• Psoas abscess

• Bilocular hydrocele

• Plunging ranula

• Compound ganglion of palm