I had a particularly challenging and rewarding therapy case that I've been thinking about how to describe in case a question such as this comes up. The "challenge" was lack of honest communication, an accurate case conceptualization (although difficult to use as she wasn't completely forthcoming and new information came out over time, and extreme transference/lack of attendance)…It is completely understanding for a client to withhold information, especially with a new therapist, however, this lack of honest communication made therapy challenging. The good news is that I learned a TON from this case and that she ended up opening up eventually, although she was eventually discharged due to policy regarding attendance..but she was transferred to another therapist in the clinic.
Also, another one of my first EVER therapy cases was couples counseling…talk about a REWARDING…CHALLENGE!
The challenging cases are always fun.