Table II. Radiological and histopathologically determined characteristics of groove pancreatitis.
| Histopathology |
Diagnosis | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| No. | CT | MRCP | EUS | Suspected diagnosis | Microscopy | No. of cysts | Special features | Distance into HOP (cm) | |
| 1 | 4 cm MHOP, BDD, PDD | Not done | CP | Pancreatic cancer | GF, BGH, EP, antral gastritis | Multiple Max. size 0.2 cm | Necrosis <1 mm to PD | 1.5 | Pure GP |
| 2 | 4 cm CMHOP | CCDW, BDD | DS, CCDW | GP | CCDW (×3), EP, BGH, GF | 3 Max. size 1.5 cm | – | 1.5 | Pure GP |
| 3 | 2 cm CMHOP | Not done | Not done | Cystic tumour | CCDW, GF, EP, CPHOP | Multiple Max. size 1.8 cm | – | NA | Segmental GP |
| 4 | DWT, CCDW | Not done | CP, SHOP, DWT, BDD, PDD | GP | BDD, PDD, CCDW, GF, EP, BGH | 15 Max. size 0.3 cm | Rupture of Santorini duct | 0.8 | Pure GP |
| 5 | DWT, CP, CCDW | Not done | CP, DS, DWT, BDD, PDD | GP | CCDW, GF, EP, BGH, CPHOP | 2 Max. size 1.5 cm | – | 1.2 | Segmental GP |
| 6 | Not done | MHOP, BDD | DPDD, CMHOP | Cystic tumour | CCDW, EP, GF | Multiple Max. size 1.1 cm | Ruptured Santorini duct | 2.5 | Pure GP |
| 7 | DWT, DS, CDDW, CP | DWT, CCDW | Not done | GP | CCDW, GF, BGH, CPHOP, antral gastritis | Multiple Max. size 1.0 cm | – | 1 | Segmental GP |
| 8 | Not done | 5 cm CMHOPDWT | CCDW, DS | GP | CCDW, EP, BGH, DS, antral gastritis | 3 Max. size 2.0 cm | – | 0.7 | Pure GP |
| 9 | DWT, BDD | BDD, PDD | CP, BDD, PDD | Ampullary tumour | CCDW, GF, BGH, EP | Multiple Max. size 1.0 cm | – | 1.3 | Pure GP |
| 10 | CMHOPDWT | Not done | DWT, CCDWCP | GP | CCDW, GF, BGH, EP | Multiple Max. size 0.2 cm | – | 0.8 | Pure GP |
| 11 | 3 cm CMHOP | 1.5 cm MHOP, BDD, PDD | 1.3 cm CMHOP, BDD, CP | Pancreatic cancer | GF, BGH, EP | 1 Max. size 0.5 cm | – | 0.5 | Pure GP |
CT, computed tomography; MRCP, magnetic resonance cholangiopancreatogram; EUS, endoscopic ultrasound; HOP, head of pancreas; MHOP, mass head of pancreas; BDD, biliary duct dilatation; CMHOP, cystic mass head of pancreas; SHOP, swollen head of pancreas; DWT, duodenal wall thickening; CCDW, cystic changes duodenal wall; CP, chronic pancreatitis; CPHOP, chronic pancreatitis head of pancreas; DS, duodenal stenosis; PDD, pancreatic duct dilatation; DPDD, distal pancreatic duct dilatation; GP, groove pancreatitis; GF, groove fibrosis and scarring; BGH, Brunners’ gland hyperplasia (duodenum); EP, ectopic pancreatic tissue.