# VIPoma and WDHA Syndrome

> VIPoma and WDHA for NEET-PG Surgery: Verner-Morrison syndrome, secretory watery diarrhoea, hypokalaemia, achlorhydria, octreotide, enucleation.

- Canonical URL: https://prepelephant.com/topics/neet-pg/surgery/vipoma-wdha
- Exam / course: NEET-PG · Subject: Surgery
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-02
- Last updated: 2026-10-02
- How to cite: "VIPoma and WDHA Syndrome", PrepElephant, https://prepelephant.com/topics/neet-pg/surgery/vipoma-wdha

## Direct answer

Rare neuroendocrine tumours of the pancreatic body or tail that secrete vasoactive intestinal peptide cause VIPoma and its WDHA syndrome — watery diarrhoea, hypokalaemia and achlorhydria — also called Verner-Morrison syndrome or pancreatic cholera. The diarrhoea is secretory and prodigious: more than a litre (often 3 litres or more) of tea-coloured stool daily, persisting unchanged during fasting, with profound hypokalaemia (sometimes below 2.5 mmol/L), metabolic acidosis from stool bicarbonate loss, flushing in some, and hypo- or achlorhydria from VIP inhibition of acid secretion. Diagnosis rests on fasting VIP levels — clearly elevated (thresholds vary by assay, commonly quoted above 75 up to above 190 pg/mL, with values above 500 classic) — plus CT or MRI and somatostatin-receptor imaging. Octreotide controls the diarrhoea and potassium loss in most patients; resection — distal pancreatectomy or enucleation — cures localised disease, with metastatic cases managed by debulking, ablation and somatostatin analogues.

## What you must remember

- **The acronym is the checklist:** WDHA — watery diarrhoea (secretory, fasting-invariant), hypokalaemia (stool potassium loss, dangerous arrhythmia territory), achlorhydria or hypochlorhydria; VIP also causes hyperglycaemia, hypercalcaemia and flushing in a minority — the "pancreatic cholera" picture.
- **Site and behaviour:** most VIPomas arise in the pancreatic body-tail; roughly half to two-thirds are malignant at diagnosis (hepatic metastases common), distinguishing it from insulinoma, which is malignant in only about a tenth.
- **Diagnostic test pairing:** fasting serum VIP during active diarrhoea — assay-dependent cut-offs (above 75-190 pg/mL commonly cited; higher values more specific) — plus stool volume documentation; exclude other secretory diarrhoeas (gastrinoma — acidic and ulcerating; carcinoid with 5-HIAA; laxative abuse).
- **First drug to reach for:** octreotide, a somatostatin analogue, binds tumour receptors and shuts off VIP release — controlling fluid and electrolyte losses before, after and instead of surgery; prednisone and loperamide-class agents are weak adjuncts.
- **Fluid and electrolyte rescue:** patients arrive dry, hypokalaemic and acidotic — litres of saline with aggressive potassium replacement precede any imaging adventure; death historically was from hypokalaemia, not tumour.
- **Operation for localised disease:** distal pancreatectomy for body-tail tumours, enucleation for small favourable lesions away from the duct; intraoperative palpation and ultrasound because multiplicity occurs.
- **Advanced disease strategy:** cytoreductive surgery, radiofrequency ablation of liver metastases, everolimus or streptozocin-based chemotherapy, peptide receptor radionuclide therapy — VIPomas overexpress somatostatin receptors, which both images and treats them.

## A typical exam case

A 55-year-old woman is admitted after three months of six to ten watery stools daily, 4 kilograms of weight loss, and two near-syncope episodes. Potassium is 2.1 mmol/L with bicarbonate of 14, glucose mildly raised. The stool is large-volume and remains voluminous during a 48-hour fast — the single bedside observation that excludes osmotic diarrhoea. Fasting VIP returns markedly elevated. After fluid and potassium resuscitation and octreotide 100 micrograms thrice daily, the diarrhoea slows within 48 hours — a diagnostic-therapeutic response in itself. CT shows a 5-centimetre pancreatic tail tumour with two liver lesions; DOTATATE PET confirms receptor expression. She undergoes distal pancreatectomy with wedge ablation of the metastases, continues depot octreotide, and her potassium normalises. The alternative presentation — the same chemistry with no lesion on CT — is investigated with endoscopic ultrasound and somatostatin imaging, remembering the rare extra-pancreatic VIPoma in ganglioneuroma-spectrum tumours, particularly in children.

## Where students slip

Examiners contrast the pancreatic endocrine tumours by their "signature secretion": insulinoma — hypoglycaemia with Whipple's triad; gastrinoma — acid ulcers; VIPoma — water and potassium; glucagonoma — migratory necrolytic erythema with diabetes; somatostatinoma — gallstones, steatorrhoea and diabetes. A watery-diarrhoea stem with hypokalaemia expects VIPoma, and the mark is lost only if the candidate forgets the achlorhydria component or calls the diarrhoea osmotic. The second trap is the potassium — the exam wants the candidate to treat hypokalaemia as the immediate threat, before VIP levels return. Third, behaviour: VIPoma is malignant in over half, so an MCQ pairing it with "usually benign" (true for insulinoma) is wrong.

## Frequently asked questions

### What does WDHA stand for?

Watery diarrhoea, hypokalaemia and achlorhydria — the triad produced by VIP-secreting tumours, also known as Verner-Morrison syndrome or pancreatic cholera.

### How is VIPoma diarrhoea characterised?

Large-volume secretory watery diarrhoea — typically over a litre, often several litres daily — that persists during fasting, distinguishing it from osmotic diarrhoea which stops with nil-by-mouth.

### What laboratory test confirms VIPoma?

A clearly elevated fasting serum VIP level during active diarrhoea, with assay-dependent thresholds (commonly above 75-190 pg/mL), supported by hypokalaemia and metabolic acidosis.

### Why is octreotide central to management?

Somatostatin analogue therapy switches off VIP release from receptor-expressing tumour, controlling the life-threatening fluid and potassium losses before surgery and long term in unresectable disease.

### What operation cures a localised pancreatic VIPoma?

Distal pancreatectomy for body-tail tumours or enucleation for small lesions away from the pancreatic duct, after octreotide and electrolyte stabilisation.