42. Mucinous carcinoma

Staining: HE

Organ: Breast

Description:

The top of the slide shows normal breast tissue. The tumor is obvious.

The tumor cells form clusters that are “floating in a sea of mucin”. These tumor cells have lost their orientation and therefore secrete mucin outwards instead of inwards (into an acinus)

Diagnosis: Mucinous carcinoma

Risk factors:

  • Usually older women
  • Probably same as for other breast cancers

Theory:

Mucinous carcinoma is a rare type of breast carcinoma, accounting for less than 3% of cases. It has a better prognosis than invasive ductal carcinoma.

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41. Invasive ductal carcinoma

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43. Seborrhoeic keratosis

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