67Ga Scintigraphy for Assessment of Disease Severity and Treatment Response in Patients With Paracoccidioidomycosis.

OBJECTIVE

The evaluation of therapy response of patients with deep mycosis is a major challenge. The aim of this study was to assess the severity of disease at admission and evaluate treatment response of patients with paracoccidioidomycosis using Ga scintigraphy.

SUBJECTS AND

METHODS

Seventy-three patients with fully active disease were enrolled. A scoring system based on clinicoradiological and serological evaluation and Ga scan was devised. Pretherapy Ga score of 73 patients was compared with clinicoradiological and serological scores. A subgroup of 23 patients was followed up during treatment, and the rates of improvement of their clinicoradiological, serological, and Ga scores during treatment were compared at 3 time points (fully active phase, after clinical improvement, and clinically inactive disease).

RESULTS

The correlations between scores before therapy were statistically significant. Ga score correlated with clinical score (r = 0.47, P < 0.001). Serological score correlated with both Ga and clinical scores (r = 0.32, P = 0.006, and r = 0.25, P = 0.034, respectively). Concerning evaluation of therapy response, clinicoradiological, serological, and Ga scores decreased significantly after therapy (P < 0.001). Notably, Ga score was the single one to become negative in most patients at the end of treatment (20 of 23 patients compared with 7 on clinicoradiological evaluation and 10 on serology, P = 0.003).

CONCLUSIONS

In patients with paracoccidioidomycosis, pretherapy Ga scintigraphy correlates with disease severity. Serial Ga scans seem to be helpful in evaluating the response to therapy.