
    Given the length of each side of a pentagon-shaped region of interest (ROI) in millimeters from a medical scan, calculate the total boundary length of the anatomical structure or lesion being analyzed. This measurement is crucial for quantitative analysis in diagnostic imaging and helps determine the extent of the identified medical condition.
    

    
import math

def perimeter_pentagon(a):
    """
    Given the length of each side of a pentagon-shaped region of interest (ROI) in millimeters from a medical scan, calculate the total boundary length of the anatomical structure or lesion being analyzed. This measurement is crucial for quantitative analysis in diagnostic imaging and helps determine the extent of the identified medical condition.
    

    """
import math

def perimeter_pentagon(a):
    """
    Given the length of each side of a pentagon-shaped region of interest (ROI) in millimeters from a medical scan, calculate the total boundary length of the anatomical structure or lesion being analyzed. This measurement is crucial for quantitative analysis in diagnostic imaging and helps determine the extent of the identified medical condition.
    

    """
    perimeter = 5 * a
    return perimeter