“We will have to wait until the outcome of the investigation,” a spokeswoman added.

Several files were found, including details relating to the adoption of a young girl, giving her real name, address and date of birth, and information relating to a baby born an alcoholic.

Public Health Minister Shona Robison said she had received assurances from NHS Tayside the documents had been cleared from the site when that was not the case.

The health authority also told her they had put in place procedures “to ensure it didn’t happen again” while the confidential information was still lying inside the disused hospital.

NHS Tayside Chairman Sandy Watson assured Ms Robison in February the matter was “being brought to a satisfactory if belated conclusion”.

In a letter dated December 12, 2007, Ms Robison, who is Dundee East MSP, asked him to give the matter “serious attention” after being informed of the dumped medical records by a local paranormal group.

Speaking today, Ms Robison said, “In the letter to me in February they (NHS Tayside) said to me they were having an inquiry into how this happened.

“It (the inquiry) may well have happened, I would have expected them to have done that, and looked at the circumstances of how records could have been left in a decommissioned building.

“The letter said they were going to have an inquiry and put in place procedures to ensure it didn’t happen again.”

She continued, “The number one priority is to make sure there are no records whatsoever left in Strathmartine.”

A local paranormal group, who were exploring the former hospital, first reported finding medical records last April.

Having contacted NHS Tayside they were assured the site had been cleared, but on returning discovered this was not the case.

They contacted Ms Robison, who then wrote to Mr Watson asking him to give the matter “serious attention”.

Having been made aware the records had still not been removed, Ms Robison wrote a second letter in January.

It said she did not understand why no one had yet met the complainant, Karen McAulay, of Paranormal Research Scotland, to find out the exact locations of the documents.

Ms Robison received a response from Mr Watson at the beginning of February explaining staff visited the site in January and removed documents from some buildings.

However, due to the amount of rubbish in the basement of the main building, they would have to return to check whether there were any documents hidden amongst the rubbish.

A spokeswoman for NHS Tayside said today an internal investigation was under way.

“We are continuing to investigate how this situation arose.

“However, our priority is to make sure any documents that remain on site are removed.”