  In this work, we present for the first time the general solution of the
temporal evolution equation arising from the matching of a conformally flat
interior to the Vaidya solution. This problem was first articulated by Banerjee
et al. (A. Banerjee, S. B. Dutta Choudhury, and Bidyut K. Bhui, Phys. Rev. D,
40 (670) 1989) in which they provided a particular solution to the temporal
equation. This simple exact solution has been widely utilized in modeling
dissipative collapse with the most notable result being a prediction of the
avoidance of the horizon as the collapse proceeds. We study the dynamics of
dissipative collapse arising from the general solution obtained via the method
of symmetries and of the singularity analysis. We show that the end-state of
collapse for our model is significantly different from the widely used linear
solution.
