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MRCPUK Endocrinology and Diabetes (Specialty Certificate Examination) Sample Questions:

1. A 15-year-old boy was referred by the school nurse because she was concerned about his weight. There was no past history of note. He was not taking any medication. His height was 1.61 m and he weighed 70.5 kg.
Investigations: growth chartsee image

What is the most likely diagnosis?

A) leptin deficiency
B) Prader-Willi syndrome
C) simple obesity
D) growth hormone deficiency
E) Cushing's disease

2. A 23-year-old barmaid presented with headache, sweating and collapse. She had a past medical history of tension headache and unexplained abdominal pain. Her regular medication included amitriptyline 25 mg at night and paracetamol 1 g as required. She was a smoker and regularly drank alcohol.
On examination, her pulse was 120 beats per minute and her blood pressure was 210/128 mmHg.
Investigations:
24-h urinary metanephrine5.4 umol (<2)
24-h urinary normetanephrine15.2 umol (<3) What substance is most likely to cause assay interference in the measurement of urinary metanephrines?

A) amitriptyline
B) caffeine
C) alcohol
D) paracetamol
E) nicotine

3. A 72-year-old woman presented with a painless swelling in the front of the neck, which she had first noticed 2-3 months previously. She was otherwise well, with no symptoms of mass effect in her neck, and was not taking any medication.
On examination, her thyroid gland was moderately enlarged, and felt uniformly nodular. There was no associated lymphadenopathy. Her pulse was 78 beats per minute and regular, and there were no signs of thyrotoxicosis.
Investigations:
serum thyroid-stimulating hormone<0.01 mU/L (0.4-5.0)
serum free T424.8 pmol/L (10.0-22.0)
serum free T310.3 pmol/L (3.0-7.0)
technetium-99m scan of thyroid (20-min uptake)patchy uptake in both thyroid lobes
What is the most appropriate management?

A) repeat thyroid function tests after 6 months
B) partial thyroidectomy
C) total thyroidectomy
D) radioiodine
E) carbimazole plus levothyroxine

4. A 25-year-old man presented with a 2-month history of thirst and polyuria. He had minimal weight loss and his body mass index was 26 kg/m2 (18-25). He had had sensorineural deafness since childhood. There was a very strong family history of sensorineural deafness and type 2 diabetes mellitus.
Urinalysis showed no ketones.
Investigations:
random plasma glucose18.0 mmol/L
What is the most appropriate next step in management?

A) water deprivation test to assess posterior pituitary function
B) test for mitochondrial diabetes
C) measurement of glutamic acid decarboxylase antibodies
D) genetic testing for maturity-onset diabetes of the young
E) test for HFE genotype

5. A 62-year-old woman was referred with generalised weakness. She had no previous history of note and was not taking any medication. She reported drinking 60 units of alcohol per week.
On examination, she was found to have central adiposity, pale abdominal striae and
wasting of the limb muscles. Her blood pressure was raised at 160/100 mmHg.
Investigations:
serum sodium138 mmol/L (137-144)
serum potassium3.8 mmol/L (3.5-4.9)
serum cortisol (09.00 h)750 nmol/L (200-700)
low-dose dexamethasone suppression test (2 mg/day for 48 h):
serum cortisol120 nmol/L (<50)
high-dose dexamethasone suppression test (8 mg/day for 48 h):
serum cortisol45 nmol/L (should suppress to
<50% of day 0 value)
24-h urinary free cortisol 360 nmol (55-250)
plasma adrenocorticotropic hormone (09.00 h)22.0 pmol/L (3.3-15.4)
MR scan of pituitary glandnormal
CT scan of adrenal glands1-cm mass in the left adrenal gland
What is the most likely cause for her presentation?

A) adrenal carcinoma
B) adrenal adenoma
C) pseudo-Cushing's syndrome
D) ectopic adrenocorticotropic hormone syndrome
E) Cushing's disease

Solutions: