OBJECTIVES:

to investigate the possible causes of the negative cones, to establish strategies to reduce their incidence and to develop monitoring protocols.

MATERIALS AND METHODS:

This is a retrospective observational cases and controls study of 432 conizations made in the Hospital Universitario La Paz (HULP) between 2013 and 2015. The most important analysed variables were the pathological anatomy of the piece and its relationship with the biopsy and previous cytology, the cone length, as well as the presence and artefact and cervicitis. The analysis it was used Chi - Square and Fisher´s test, T-Student, Mann Whitney U, Kruskal-Wallis and Kolmogorov- Smirnov.

RESULTS:

There are two groups: 371 positive (85,9%) and 61 negative cones (14,1%). We find statistically significant differences in the cytology, colposcopy and biopsy pre-conization, finding a major percentage of injuries of lesser degree in the patients with negative cone. The length of the cone was lower in the analysis group and in this we also observed a greater percentage of cervicitis and artefacts.

CONCLUSIONS:

The causes that make the remaining injury not appear after a diagnosed and/or therapeutic conization are a wide variety and difficult to prove. We should try to treat the patients with inflammation or atrophy to avoid false positives in the cytology and biopsy, improve the surgical technique to avoid artefacts and perform conservative management of low-risk injuries.

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