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for this image give 3 mark question for spotting

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The image confirms Congenital Hydrocephalus in an infant. Here is a well-structured 3-mark spotting question based on the image:

Spotting Question (3 Marks)

"Look at the clinical photograph of this infant and answer the following:"

Q1. What is the diagnosis? (1 mark)

Answer: Congenital Hydrocephalus
  • The photograph shows a markedly enlarged, globular head (macrocephaly) with craniofacial disproportion (the cranial vault is disproportionately large compared to the face), prominent distended scalp veins, and the classic "Setting Sun" sign (downward deviation of both eyes with visible sclera above the iris), all of which are hallmark features of hydrocephalus in an infant.

Q2. Name TWO clinical signs visible in this image and the mechanism behind ONE of them. (1 mark)

Answer:
  1. Setting Sun Sign - caused by raised intracranial pressure (ICP) compressing the tectal plate (superior colliculus) of the midbrain, impairing upward conjugate gaze and forcing the eyes downward.
  2. Dilated/engorged scalp veins - due to increased ICP causing obstruction of venous drainage from the brain, with consequent development of collateral venous channels over the scalp.
(Other acceptable signs: macrocephaly / frontal bossing / bulging fontanelle)

Q3. Name the standard surgical treatment for this condition. (1 mark)

Answer: Ventriculoperitoneal (VP) shunt - a catheter is placed in the lateral ventricle and tunneled subcutaneously to drain excess CSF into the peritoneal cavity, relieving intracranial pressure.
(Alternate acceptable answer: Endoscopic Third Ventriculostomy / ETV - preferred for obstructive hydrocephalus)
Key teaching points for this spot:
  • Macrocephaly + Setting Sun sign + scalp vein prominence = Hydrocephalus triad in infants
  • Sutures are not fused in infants, so the skull expands before pressure causes herniation
  • Cranial circumference >2 SD above mean for age/sex = macrocephaly (formal definition)
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