Table 1 Clinicopathologic comparison of cysts ≥1 cm accompanying ordinary PDACs classified as IPMN/MCN versus pseudo-IPMN (n = 130).

From: Pancreatic ductal adenocarcinomas associated with intraductal papillary mucinous neoplasms (IPMNs) versus pseudo-IPMNs: relative frequency, clinicopathologic characteristics and differential diagnosis

 

PDAC with IPMN/MCN

PDAC with pseudo-IPMN

Total number of the cases

90

40

True frequency in 501 systematically evaluated cases

6.2%; n = 31

3.8%; n = 19

Mean age (range), years

65 (29–82)

67 (50–87)

Male gender, %

39

44

Cysts located in body/tail, %

44

50

Mean size of PDAC (range), cm

2.0 (0.1–7.0)

3.8 (1.2–7.0)

Mean size of cystic component (range), cm

5.7 (1.0–25.2)

1.9 (1.0–11.0)

Pre-operative diagnosis of IPMN

84% (94%, after 2010)

33%*

  1. PDACs pancreatic ductal adenocarcinomas, IPMN intraductal papillary mucinous neoplasm, MCN mucinous cystic neoplasm.
  2. *Results of pre-operative imaging studies were available to the authors in 27 of 40 patients with pseudo-IPMN, and in 9 of these (33%) pre-operative diagnosis was IPMN.
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